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{{short description|Reference to a source}} | |||
{{otheruses}} | |||
{{for-multi|"<ci<nowiki/>te>"|HTML element#cite|other uses|Citation (disambiguation)|and|Cité (disambiguation)|and|CITE (disambiguation)}} | |||
{{selfref|For Misplaced Pages's citation guideline, see ]}} | |||
{{for-text|help making citations within Misplaced Pages|]|help citing Misplaced Pages in external sources|]}} | |||
{{Research}} | |||
]'' webcomic titled "] Protester". The sign says: "{{bracket|]}}".<ref>{{Cite web |url=https://xkcd.com/285/ |title=Wikipedian Protester |first=Randall |last=Munroe |work=xkcd |access-date=25 May 2020 |archive-date=25 December 2011 |archive-url=https://web.archive.org/web/20111225215024/https://www.xkcd.com/285/ |url-status=live }}</ref>]] | |||
A '''citation''' is a ] to a source. More precisely, a citation is an abbreviated alphanumeric expression embedded in the body of an intellectual work that denotes an entry in the bibliographic references section of the work for the purpose of acknowledging the relevance of the works of others to the topic of discussion at the spot where the citation appears. | |||
Generally, the combination of both the in-body citation and the bibliographic entry constitutes what is commonly thought of as a citation (whereas bibliographic entries by themselves are not). | |||
A '''citation''' or '''bibliographic citation''' is a reference to a book, ], ], or other published item, with sufficient detail to allow a reader to locate it. Different citation systems and styles are used in ], ], ], and the ]. | |||
Citations have several important purposes. While their uses for upholding intellectual honesty and bolstering claims are typically foregrounded in teaching materials and style guides (e.g.,<ref>{{Cite web |url=https://integrity.mit.edu/handbook/citing-your-sources/avoiding-plagiarism-cite-your-source |title=What Does it Mean to Cite? |publisher=MIT Academic Integrity |access-date=2015-09-28 |archive-date=2017-07-10 |archive-url=https://web.archive.org/web/20170710203103/http://integrity.mit.edu/handbook/citing-your-sources/avoiding-plagiarism-cite-your-source |url-status=live }}</ref><ref>Association of Legal Writing Directors & Darby Dickerson, ''ALWD Citation Manual: A Professional System of Citation,'' 4th ed. (New York: Aspen, 2010), 3.</ref>), correct attribution of insights to previous sources is just one of these purposes.<ref>Mansourizadeh, Kobra, and Ummul K. Ahmad. "Citation practices among non-native expert and novice scientific writers." ''Journal of English for Academic Purposes'' 10, no. 3 (2011): 152–161.</ref> Linguistic analysis of citation-practices has indicated that they also serve critical roles in orchestrating the state of knowledge on a particular topic, identifying gaps in the existing knowledge that should be filled or describing areas where inquiries should be continued or replicated.<ref>Swales, J. M. (2004). Research genres: Explorations and applications. Cambridge University Press. 10.1017/CBO9781139524827</ref> Citation has also been identified as a critical means by which researchers establish stance: aligning themselves with or against subgroups of fellow researchers working on similar projects and staking out opportunities for creating new knowledge.<ref>Hyland, K., & Jiang, F. (2019). Points of reference: Changing patterns of academic citation. Applied Linguistics, 40(1), 64–85.</ref> | |||
== Citation content == | |||
Citation content may include: | |||
Conventions of citation (e.g., placement of dates within parentheses, superscripted ], colons or commas for page numbers, etc.) vary by the citation-system used (e.g., ],<ref>{{Cite web |url=http://www.lc.unsw.edu.au/onlib/refbib.html |title=Oxford Referencing System |access-date=18 January 2011 |archive-date=30 June 2017 |archive-url=https://web.archive.org/web/20170630023831/http://www.lc.unsw.edu.au/onlib/refbib.html |url-status=live }}</ref> ], ], ], ] (ASA), ] (APA), etc.). Each system is associated with different ], and ] associated with these disciplines maintain the relevant citational style by recommending and adhering to the relevant ]. | |||
*of a book: author(s), book title, publisher, date of publication, and page number(s) if appropriate;<ref>Long Island University.</ref><ref>Duke University Libraries 2007.</ref> | |||
*of a journal article: author(s), article title, journal title, volume and issue numbers, date of publication, and page number(s); | |||
*of a newspaper: author(s), article title, name of newspaper, section title and page number(s) if desired, date of publication; | |||
*of a work on the Web: author(s), article and publication title where appropriate, as well as a ], and a date when the site was accessed. | |||
*of a play: inline citations offer part, scene, and line numbers, the latter separated by periods: 4.452 refers to scene 4, line 452. For example, "In Eugene Onegin, Onegin rejects Tanya when she is free to be his, and only decides he wants her when she is already married" (Pushkin 4.452-53).<ref name=Brigham>Brigham Young University 2008.</ref> | |||
*of a poem: If the text is more than one line of the poem, use a slash (/) with a space before and after it to indicate the separate lines. Include the word "line" or "lines" in the Harvard reference. For example: "For I must love because I live / And life in me is what you give." (Brennan, lines 15-16).<ref name=Brigham/> | |||
== Concept == | |||
A ''bibliographic citation'' is a reference to a book, ], ], or other published item. Citations should supply sufficient detail to identify the item uniquely.<ref>{{Cite web |url=http://www.ben.edu/library/help/glossary.htm |title=Library glossary |date=August 22, 2008 |publisher=] |archive-url=https://web.archive.org/web/20080430220849/http://www.ben.edu/library/help/glossary.htm |archive-date=April 30, 2008 |access-date=2009-02-27}}</ref> Different citation systems and styles are used in ], ], ], ], and the ]. Regarding the use of citations in the scientific literature, some scholars also put forward "the right to refuse unwanted citations" in certain situations deemed inappropriate.<ref>{{Cite journal|author1=Jaime A. Teixeira da Silva|author2= Quan-Hoang Vuong|date=2021|title=The right to refuse unwanted citations: rethinking the culture of science around the citation | journal=Scientometrics |volume=126|issue=6|pages=5355–5360|doi=10.1007/s11192-021-03960-9|pmid= 33994602|pmc= 8105147|doi-access=free}}</ref> | |||
== Content == | |||
Along with information such as author(s), date of publication, title and page numbers, citations may also include unique identifiers depending on the type of work being referred to. | |||
Citation content can vary depending on the type of source and may include: | |||
* Citations of books may include an ] (ISBN). | |||
* ''Book:'' authors, book title, place of publication, publisher, date of publication, and page numbers if appropriate.<ref>{{Cite web |url=http://www2.liu.edu/cwis/cwp/library/workbook/evaluate.htm#citing |title=Anatomy of a Citation |website=LIU.edu |url-status=dead |archive-url=https://web.archive.org/web/20150905125227/http://www2.liu.edu/cwis/cwp/library/workbook/evaluate.htm#citing |archive-date=2015-09-05 |access-date=2015-09-28 |ref=refLongIslandUni}}</ref> | |||
* Specific volumes, articles or other identifiable parts of a periodical, may have an associated ] (SICI). | |||
* ''Journal:'' authors, article title, journal title, date of publication, and page numbers. | |||
* Electronic documents may have a ] (DOI). | |||
* ''Newspaper:'' authors, article title, name of newspaper, section title and page numbers if desired, date of publication. | |||
* ''Web site:'' authors, article, and publication title where appropriate, as well as a ], and a date when the site was accessed. | |||
* ''Play:'' inline citations offer part, scene, and line numbers, the latter separated by periods: 4.452 refers to scene 4, line 452. For example, "In Eugene Onegin, Onegin rejects Tanya when she is free to be his, and only decides he wants her when she is already married" (Pushkin 4.452–53).<ref name="Brigham">{{Cite web |url=http://www.byui.edu/english/mlaguide/MLA_intext_citation.htm |title=How to cite sources in the body of your paper |year=2008 |website=BYUI.edu |url-status=dead |archive-url=https://web.archive.org/web/20111113174823/http://www.byui.edu/english/mlaguide/MLA_intext_citation.htm |archive-date=November 13, 2011 |access-date=2008-02-08 |ref=refBrigham}}</ref> | |||
* ''Poem:'' spaced ] are normally used to indicate separate lines of a poem, and ] usually include the line numbers. For example: "For I must love because I live / And life in me is what you give." (Brennan, lines 15–16).<ref name=Brigham/> | |||
* ''Interview:'' name of interviewer, interview descriptor (ex. personal interview), and date of interview. | |||
* ''Data:'' authors, dataset title, date of publication, and publisher. | |||
=== Unique identifiers === | |||
Along with information such as authors, date of publication, title and page numbers, citations may also include ]s depending on the type of work being referred to. | |||
* Citations of books may include an ] (ISBN). | |||
* Specific volumes, articles, or other identifiable parts of a periodical, may have an associated ] (SICI) or an ] (ISSN). | |||
* Electronic documents may have a ] (DOI). | |||
* Biomedical research articles may have a PubMed Identifier (]). | * Biomedical research articles may have a PubMed Identifier (]). | ||
== |
== Systems == | ||
Broadly speaking, there are two types of citation systems, the Vancouver system and parenthetical referencing.<ref name="ELhelpdesk">{{cite web |last=Pantcheva |first=Marina |date=nd |title=Citation styles: Vancouver and Harvard systems |url=https://site.uit.no/english/writing-style/citationstyles/ |website=site.uit.no |access-date=July 2, 2020 |archive-date=July 1, 2020 |archive-url=https://web.archive.org/web/20200701114257/https://site.uit.no/english/writing-style/citationstyles/ |url-status=live }}</ref> However, the ] (CSE) adds a third, the'' citation-name system''.<ref name="council2006scientific">Council of Science Editors, Style Manual Committee (2007). Scientific style and format: the CSE manual for authors, editors, and publishers.</ref> | |||
=== Vancouver system === | |||
There are broadly two citation systems:<ref>University of Maryland 2006.</ref><ref name=YaleUni>Yale University 2008.</ref><ref name=ColoradoStateUni>Colorado State University 2008.</ref> | |||
{{main|Vancouver system}} | |||
The Vancouver system uses sequential numbers in the text, either bracketed or superscript or both.<ref>{{Cite web |title=Vancouver (Numbering) |url=https://intranet.birmingham.ac.uk/as/libraryservices/library/referencing/icite/vancouver/index.aspx |access-date=2022-11-03 |website=University of Birmingham |language=en-GB}}</ref> The numbers refer to either footnotes (notes at the end of the page) or endnotes (notes on a page at the end of the paper) that provide source detail. The notes system may or may not require a full bibliography, depending on whether the writer has used a full-note form or a shortened-note form. The organizational logic of the bibliography is that sources are listed in their order of appearance in-text, rather than alphabetically by author last name. | |||
For example, an excerpt from the text of a paper using a notes system ''without'' a full bibliography could look like: | |||
=== Parenthetical systems === | |||
:"The five stages of grief are denial, anger, bargaining, depression, and acceptance."<sup>1</sup> | |||
In-text parenthetical citations include abbreviated source information (for example, author and page number) in parentheses in the article text. This is supplemented by complete source information in a list of Works Cited, References, or Bibliography at the end of the paper. | |||
The note, located either at the foot of the page (footnote) or at the end of the paper (endnote) would look like this: | |||
:1. Elisabeth Kübler-Ross, ''On Death and Dying'' (New York: Macmillan, 1969) 45–60. | |||
:The five stages of grief are denial, anger, bargaining, depression, and acceptance (Kubler-Ross, 1969, chap.3). | |||
In a paper with a full bibliography, the shortened note might look like: | |||
: |
:1. Kübler-Ross, ''On Death and Dying'' 45–60. | ||
The bibliography entry, which is required with a shortened note, would look like this: | |||
=== Note systems === | |||
:Kübler-Ross, Elisabeth. ''On Death and Dying''. New York: Macmillan, 1969. | |||
Note systems involve the use of sequential numbers in the text which refer to either footnotes (notes at the end of the page) or endnotes (a note on a separate page at the end of the paper) which give the source detail. The notes system may or may not require a full bibliography, depending on whether the writer has used a full note form or a shortened note form. | |||
In the humanities, many authors also use footnotes or endnotes to supply anecdotal information. In this way, what looks like a citation is actually supplementary material, or suggestions for further reading.<ref>{{Cite web |url=http://www.studenthandouts.com/citations.htm |title=How to Write Research Papers with Citations: MLA, APA, Footnotes, Endnotes |access-date=2010-01-31 |archive-date=2010-06-16 |archive-url=https://web.archive.org/web/20100616071855/http://www.studenthandouts.com/citations.htm |url-status=live }}</ref> | |||
For example, an excerpt from the text of a paper using a notes system ''without a full bibliography'' could look like this: | |||
=== Parenthetical referencing === | |||
:The five stages of grief are denial, anger, bargaining, depression, and acceptance.<sup>1</sup> | |||
{{main|Parenthetical referencing}} | |||
Parenthetical referencing, also known as Harvard referencing, has full or partial, in-text, citations enclosed in circular brackets and embedded in the paragraph.<ref>{{cite web|last1=libguides|first1=liu.cwp|title=Parenthetical Referencing|url=https://liu.cwp.libguides.com/APAstyle/parenthetical#:~:text=Parenthetical%20references%20are%20used%20within,the%20article%20you%20are%20citing.|access-date=26 July 2020|website=liu.cwp.libguides.com|archive-date=26 July 2020|archive-url=https://web.archive.org/web/20200726214158/https://liu.cwp.libguides.com/APAstyle/parenthetical#:~:text=Parenthetical%20references%20are%20used%20within,the%20article%20you%20are%20citing.|url-status=live}}</ref> | |||
An example of a parenthetical reference: | |||
The note, located either at the foot of the page (footnote) or at the end of the paper (endnote) would look like this: | |||
:"The five stages of grief are denial, anger, bargaining, depression, and acceptance" (Kübler-Ross, 1969, pp. 45–60). | |||
Depending on the choice of style, fully cited parenthetical references may require no end section. Other styles include a list of the citations, with complete bibliographical references, in an end section, sorted alphabetically by author. This section is often called "References", "Bibliography", "Works cited" or "Works consulted". | |||
:1. Elisabeth Kubler-Ross, ''On Death and Dying'' (New York: Macmillian, 1969), 45-60. | |||
In-text references for online publications may differ from conventional parenthetical referencing. A full reference can be hidden, only displayed when wanted by the reader, in the form of a ].<ref> {{Webarchive|url=https://web.archive.org/web/20210428140433/https://livereference.org/ |date=2021-04-28 }}. Retrieved 2012-04-28.</ref> This style makes citing easier and improves the reader's experience. | |||
In a paper which contains a full bibliography, the shortened note could look like this: | |||
== Styles == | |||
:1. Kubler-Ross, ''On Death and Dying'', 45-60. | |||
{{styles}} | |||
{{further|APA style|The Chicago Manual of Style|Bluebook|MLA style|ASA style}} | |||
Citation styles can be broadly divided into styles common to the humanities and the sciences, though there is considerable overlap. Some style guides, such as ], are quite flexible and cover both parenthetical and note citation systems. Others, such as ] and ] styles, specify formats within the context of a single citation system. These may be referred to as citation formats as well as citation styles.<ref>{{Cite web |url=http://www.csuchico.edu/lref/newciting.html |title=Citation Formats & Style Manuals |year=2007 |website=CSUChico.edu |access-date=2008-02-11 |ref=refCaliforniaStateUni |archive-date=2008-02-25 |archive-url=https://web.archive.org/web/20080225232139/http://www.csuchico.edu/lref/newciting.html |url-status=live }}</ref><ref>{{Cite web |url=http://www.lesley.edu/library/guides/citation/apa.html |title=APA Citation Format |year=2005 |website=Lesley.edu |archive-url=https://web.archive.org/web/20071228053242/http://www.lesley.edu/library/guides/citation/apa.html |archive-date=December 28, 2007 |access-date=2008-02-11 |ref=refLesleyUni}}</ref><ref>{{Cite web |url=http://wally.rit.edu/pubs/guides/apa.html |title=APA Citation Format |year=2003 |website=RIT.edu |url-status=dead |archive-url=https://web.archive.org/web/20080203115324/http://wally.rit.edu/pubs/guides/apa.html |archive-date=February 3, 2008 |access-date=2008-02-11 |ref=refRIT}}</ref> The various guides thus specify order of appearance, for example, of publication date, title, and page numbers following the author name, in addition to conventions of punctuation, use of italics, emphasis, parenthesis, quotation marks, etc., particular to their style. | |||
and the bibliography entry, which would be required with a shortened note, would look like this: | |||
A number of organizations have created styles to fit their needs; consequently, a number of different guides exist. Individual publishers often have their own in-house variations as well, and some works are so long-established as to have their own citation methods too: ] for ]; ] for ]; citing the Bible by book, chapter and verse; or ] notation by play. | |||
:Kubler-Ross, Elisabeth. ''On Death and Dying''. New York: Macmillian, 1969. | |||
The ] (CSL) is an open XML-based language to describe the formatting of citations and bibliographies. | |||
== Citation styles == | |||
{{styles}} | |||
{{main|APA style|MLA style|Chicago style|Bluebook|ASA style|Harvard referencing|Vancouver system}} | |||
=== Humanities === | |||
Citation styles can broadly be divided into styles common to the Humanities and the Sciences, though there is considerable overlap. Some style guides, such as the Chicago Manual of Style, are quite flexible and cover both parenthetical and note citation systems.<ref name=ColoradoStateUni/> Others, such as ] and ] styles, specify formats within the context of a single citation system.<ref name=YaleUni/> These may be referred to as citation formats as well as citation styles.<ref>California State University 2007.</ref><ref>Lesley University 2007.</ref><ref>Rochester Institute of Technology 2003.</ref> The various guides thus specify order of appearance, for example, of publication date, title, and page numbers following the author name, in addition to conventions of punctuation, use of italics, emphasis, parenthesis, quotation marks, etc, particular to their style. | |||
* The ] (CMOS) was developed and its guide is '']''. It is most widely used in history and economics as well as some social sciences. The closely related ] style—which derives from it—is for student references, and is distinguished from the CMOS by omission of quotation marks in reference lists, and mandatory access date citation. | |||
* The Columbia style was created by Janice R. Walker and Todd Taylor to give detailed guidelines for citing internet sources. Columbia style offers models for both the humanities and the sciences. | |||
* ''Evidence Explained: Citing History Sources from Artifacts to Cyberspace'' by Elizabeth Shown Mills covers primary sources not included in CMOS, such as censuses, court, land, government, business, and church records. Includes sources in electronic format. Used by genealogists and historians.<ref name="evidence">Elizabeth Shown Mills. ''Evidence Explained : Citing History Sources from Artifacts to cyberspace.'' 2d ed. Baltimore:Genealogical Pub. Co., 2009.</ref> | |||
* ] (or author-date system) is a specific kind of ]. Parenthetical referencing is recommended by both the ] and the ]. Harvard referencing involves a short author-date reference, e.g., "(Smith, 2000)", being inserted after the cited text within parentheses and the full reference to the source being listed at the end of the article. | |||
* ] was developed by the Modern Language Association and is most often used in ] and the ], particularly in ], other ], including ] and ] in languages other than English ("]"), and some interdisciplinary studies, such as ], ] and ], film, and other ], including television. This style of citations and bibliographical format uses parenthetical referencing with author-page (Smith 395) or author- title-page (Smith, ''Contingencies'' 42) in the case of more than one work by the same author within parentheses in the text, keyed to an alphabetical list of sources on a "works cited" page at the end of the paper, as well as notes (footnotes or endnotes).{{efn|The field of ] (or communications) overlaps with some of the disciplines also covered by the MLA and has its own disciplinary style recommendations for documentation format; the style guide recommended for use in student papers in such departments in American colleges and universities is often '']'' (]); designated for short as "]".}} | |||
* The ] is published by the ] (MHRA) and most widely used in the arts and humanities in the United Kingdom, where the MHRA is based. It is available for sale both in the UK and in the United States. It is similar to MLA style, but has some differences. For example, MHRA style uses footnotes that reference a citation fully while also providing a bibliography. Some readers find it advantageous that the footnotes provide full citations, instead of shortened references, so that they do not need to consult the bibliography while reading for the rest of the publication details.<ref>The 2nd edition (updated April 2008) of the '']'' is downloadable for free from the ] official website. {{Cite web |url=http://www.mhra.org.uk/Publications/Books/StyleGuide/ |title=MHRA Style Guide: A Handbook for Authors, Editors, and Writers of Theses |year=2008 |publisher=Modern Humanities Research Association |access-date=2009-02-05 |archive-date=2005-09-10 |archive-url=https://web.archive.org/web/20050910055050/http://www.mhra.org.uk/Publications/Books/StyleGuide/ |url-status=dead }} (2nd ed.)</ref> | |||
In some areas of the humanities, footnotes are used exclusively for references, and their use for conventional ] (explanations or examples) is avoided. In these areas, the term ''footnote'' is actually used as a synonym for ''reference'', and care must be taken by editors and typesetters to ensure that they understand how the term is being used by their authors. | |||
A number of organizations have created styles to fit their needs, consequently a number of different guides exist. Individual publishers often have their own in-house variations as well, and some works are so long established as to have their own citation methods too: ] for ]; ] for ]; ] by book, chapter and verse; or ] notation by play, act and scene. | |||
=== Law === | |||
Some examples of style guides include: | |||
{{Main|Legal citation}} | |||
* The ] is a citation system traditionally used in American academic legal writing, and the Bluebook (or similar systems derived from it) are used by many courts.<ref>{{Cite web |url=https://www.law.cornell.edu/citation/ |title=Introduction to Basic Legal Citation (LII 2007 ed.) |last=Martin |first=Peter W |date=May 2007 |website=Cornell.edu |orig-year=1993 |access-date=2008-02-03 |ref=refMartin2007 |archive-date=2018-10-04 |archive-url=https://web.archive.org/web/20181004233927/https://www.law.cornell.edu/citation/ |url-status=live }}</ref> At present, academic legal articles are always footnoted, but motions submitted to courts and court opinions traditionally use inline citations, which are either separate sentences or separate clauses. Inline citations allow readers to quickly determine the strength of a source based on, for example, the court a case was decided in and the year it was decided. | |||
* The legal citation style used almost universally in Canada is based on the '']'' (AKA ''McGill Guide''), published by ''McGill Law Journal''.<ref>''''. ''McGill Law Journal''. Updated October 2008. Retrieved 2009-02-05.</ref> | |||
* British legal citation almost universally follows the '']'' (OSCOLA). | |||
=== Sciences, mathematics, engineering, physiology, and medicine === | |||
=== Humanities === | |||
*The ] |
* The ] style, or ], is often used in chemistry and some of the ]. In ACS style references are numbered in the text and in the reference list, and numbers are repeated throughout the text as needed. | ||
* In the style of the ] (AIP style), references are also numbered in the text and in the reference list, with numbers repeated throughout the text as needed. | |||
* The ] (APSA) relies on the ''Style Manual for Political Science'', a style often used by political science scholars and historians. It is largely based on that of the Chicago Manual of Style. | |||
* Styles developed for the ] (AMS), or AMS styles, such as ], are typically implemented using the ] tool in the ] typesetting environment. Brackets with the author's initials and year are inserted in the text and at the beginning of the reference. Typical citations are listed in line with alphabetic-label format, e.g. . This type of style is also called an "authorship trigraph". | |||
* The ] of ] is one of the main styles used in ] publications. | |||
* The ], recommended by the ] (CSE), is used in medical and scientific papers and research. | |||
*The ] was developed and its guide is ''The Chicago Manual of Style''. Some social sciences and humanities scholars use the nearly identical ] style. Used by writers in many fields. | |||
** In one major variant, that used by the American Society of Mechanical Engineers (ASME), citation numbers are included in the text in square brackets rather than as superscripts. All bibliographical information is exclusively included in the list of references at the end of the document, next to the respective citation number. | |||
*The Columbia Style was made by Janice R. Walker and Todd Taylor to give detailed guidelines for citing internet sources. Columbia Style offers models for both the humanities and the sciences. | |||
** The International Committee of Medical Journal Editors (ICMJE) is reportedly the original kernel of this biomedical style, which evolved from the Vancouver 1978 editors' meeting.<ref> {{Webarchive|url=https://web.archive.org/web/20191005051625/http://www.icmje.org/ |date=2019-10-05 }}.</ref> The ]/] database uses this citation style and the ] provides "ICMJE ] – Sample References".<ref>International Committee of Medical Journal Editors. {{Webarchive|url=https://web.archive.org/web/20061221120314/http://www.nlm.nih.gov/bsd/uniform_requirements.html |date=2006-12-21 }}.</ref> | |||
*] (or author-date system) is recommended by the British Standards Institution and involves a short reference (e.g Smith, 2000) being inserted after the cited text in parenthesis and the full reference being listed at the end of the article. | |||
* The American Medical Association has its own variant of Vancouver style with only minor differences. See ]. | |||
*The ] is published by the ], and is most often used in the arts and humanities, particularly in the ] where the MHRA is based. It is fairly similar to the MLA style, but with some differences. The style guide uses footnotes that fully reference a citation and has a bibliography at the end. Its major advantage is that a reader does not need to consult the bibliography to find a reference as the footnote provides all the details. The guide is available for free download.<ref>Modern Humanities Research Association 2007.</ref> | |||
* The style of the ] (IEEE), or ], encloses citation numbers within square brackets and numbers them consecutively, with numbers repeated throughout the text as needed.<ref> {{Webarchive|url=https://web.archive.org/web/20150924043706/http://www.ieee.org/documents/style_manual.pdf |date=2015-09-24 }}. Retrieved 2015-02-16.</ref> | |||
*] was developed by the ] and is most often used in the humanities, particularly in ], ], and foreign-language ]. ] is used within the text, keyed to an alphabetical list of sources on a Works Cited page at the end of the paper. See the ''MLA Handbook for Writers of Research Papers''. | |||
* In areas of biology that falls within the ] (which itself uses this citation style throughout), a variant form of author-title citation is the primary method used when making nomenclatural citations and sometimes general citations (for example in code-related proposals published in '']''), with the works in question not cited in the bibliography unless also cited in the text. Titles use standardized abbreviations following ''Botanico-Periodicum-Huntianum'' for periodicals and ''Taxonomic Literature 2'' (later ]) for books. | |||
* Pechenik citation style is a style described in ''A Short Guide to Writing about Biology'', 6th ed. (2007), by ].<ref> {{Webarchive|url=https://web.archive.org/web/20150929032143/http://www.gonzaga.edu/academics/colleges-and-schools/college-of-arts-and-sciences/majors-programs/Biology/Undergraduate_Research/Forms/citation_guide.pdf |date=2015-09-29 }} (]). ], Augustana Campus, Canada. ]. November 2007.</ref> | |||
* In 1955, Eugene Garfield proposed a ], to consolidate the integrity of ].<ref name="cisn">{{Cite journal |last=Garfield |first=Eugene |year=2006 |title=Citation indexes for science. A new dimension in documentation through association of ideas |journal=International Journal of Epidemiology |volume=35 |issue=5 |pages=1123–1127 |doi=10.1093/ije/dyl189 |pmid=16987841 |doi-access=}}</ref> | |||
=== |
=== Social sciences === | ||
* The style of the ], or ], published in the ], is most often used in ]. APA citation style is similar to ], listing the author's name and year of publication, although these can take two forms: ''name citations'' in which the surnames of the authors appear in the text and the year of publication then appears in parentheses, and ''author-date citations'', in which the surnames of the authors and the year of publication all appear in parentheses. In both cases, in-text citations point to an alphabetical list of sources at the end of the paper in a "references" section. | |||
*The ] is a citation system traditionally used in American academic legal writing, and the Bluebook (or similar systems derived from it) are used by many courts.<ref>Martin 2007.</ref> At present, academic legal articles are always footnoted, but motions submitted to courts and court opinions traditionally use ]s which are either separate sentences or separate clauses. | |||
* The ] publishes both a style manual and a style guide for publications in this field.<ref name="APSA">Stephen Yoder, ed. (2008). ''The APSA Guide to Writing and Publishing'' and ''Style Manual for Political Science''. Rev. ed. August 2006. {{Webarchive|url=https://web.archive.org/web/20150929073143/http://www.apsanet.org/PUBLICATIONS/Online-Store |date=2015-09-29 }}. Retrieved 2015-09-28.</ref> The style is close to the CMOS. | |||
* The ] utilizes a modified form of the Chicago style laid out in their publishing style guide.<ref>{{Cite web|url=http://www.aaanet.org/publications/guidelines.cfm|title=Publishing Style Guide - Stay Informed|website=www.aaanet.org|access-date=Apr 28, 2020|archive-date=October 9, 2015|archive-url=https://web.archive.org/web/20151009061048/http://aaanet.org/publications/guidelines.cfm|url-status=live}}</ref> | |||
* The ] of the ] is one of the main styles used in ] publications. | |||
== Issues == | |||
{{see also|Impact factor#Editorial policies that affect the impact factor}} | |||
*The ] is the ] style, often used in chemistry.<ref>University of California Berkeley 2006.</ref> | |||
* In the AIP style of the ], references are numbered in the text and the reference list. | |||
*The AMS styles, e.g., ], are styles developed for the ] (AMS), typically implemented using the ] tool in the ] typesetting environment. Brackets with author’s initials and year are inserted in the text and at the beginning of the reference. Typical citations are listed in-line with alphabetic-label format, e.g. . This type of style is also called a "''Authorship trigraph.''" | |||
*The ], recommended by the ], is used in medical and scientific papers and research. | |||
** In one major variant, citation numbers are included in the text in square brackets rather than as superscripts. All bibliographical information is exclusively included in the list of references at the end of the document, next to the respective citation number.<ref>American Society of Mechanical Engineers.</ref> | |||
* Pechenik is a style described in "A Short Guide to Writing about Biology" by Jan A. Pechenik.<ref>Pechenik 2003.</ref> | |||
In their research on footnotes in scholarly journals in the field of communication, Michael Bugeja and Daniela V. Dimitrova have found that citations to online sources have a rate of decay (as cited pages are taken down), which they call a "half-life", that renders footnotes in those journals less useful for scholarship over time.<ref>Bugeja, Michael and Daniela V. Dimitrova (2010). ''Vanishing Act: The Erosion of Online Footnotes and Implications for Scholarship in the Digital Age''. Duluth, Minnesota: Litwin Books. {{ISBN|978-1-936117-14-7}}</ref> | |||
== See also == | |||
*] | |||
*] | |||
*] | |||
*] | |||
*] | |||
*] | |||
*] | |||
*] | |||
*] | |||
Other experts have found that published replications do not have as many citations as original publications.<ref>{{Cite journal |last=Raymond Hubbard and J. Scott Armstrong |year=1994 |title=Replications and Extensions in Marketing: Rarely Published But Quite Contrary |url=http://cogprints.org/5199/1/Replications-and-Extensions-in-Marketing.pdf |journal=International Journal of Research in Marketing |s2cid-access=free |volume=11 |issue=3 |pages=233–248 |doi=10.1016/0167-8116(94)90003-5 |s2cid=18205635 |access-date=2017-11-01 |archive-date=2017-09-22 |archive-url=https://web.archive.org/web/20170922010807/http://cogprints.org/5199/1/Replications%2Dand%2DExtensions%2Din%2DMarketing.pdf |url-status=live }}</ref> | |||
==Notes== | |||
{{reflist|3}} | |||
Another important issue is citation errors, which often occur due to carelessness on either the researcher or journal editor's part in the publication procedure.<ref>Peoples N, Østbye T, Yan LL. "Burden of proof: combating inaccurate citation in biomedical literature". ''BMJ''. 2023 Nov 6;383. {{doi|10.1136/bmj-2023-076441}}.</ref> For example, a study that analyzed 1,200 randomly selected citations from three major business ethics journals concluded that an average article contains at least three plagiarized citations when authors copy and paste a citation entry from another publication without consulting the original source.<ref name="Serenko2021">{{Cite journal |last1=Serenko |first1=A. |last2=Dumay |first2=J. |last3=Hsiao |first3=P-C.K. |last4=Choo |first4=C.W. |date=2021 |title=Do They Practice What They Preach? The Presence of Problematic Citations in Business Ethics Research |url=http://www.aserenko.com/papers/Serenko_Do_They_Practice.pdf |journal=Journal of Documentation |volume=77 |issue=6 |pages=1304–1320 |doi=10.1108/JD-01-2021-0018 |s2cid=237823862 |access-date=2021-10-19 |archive-date=2021-10-23 |archive-url=https://web.archive.org/web/20211023193000/http://www.aserenko.com/papers/Serenko_Do_They_Practice.pdf |url-status=live }}</ref> Experts have found that simple precautions, such as consulting the author of a cited source about proper citations, reduce the likelihood of citation errors and thus increase the quality of research.<ref name="Wright2008">{{Cite journal |last1=Wright |first1=Malcolm |last2=Armstrong |first2=J. Scott |author-link2=J. Scott Armstrong |date=2008 |title=The Ombudsman: Verification of Citations: Fawlty Towers of Knowledge? |journal=Interfaces |volume=38 |issue=2 |pages=125–139 |doi=10.1287/inte.1070.0317 |issn=0092-2102 |eissn=1526-551X |jstor=25062982 |oclc=5582131729 |ssrn=1941335 |doi-access=free}}</ref> Another study noted that approximately 25% citations do not support the claims made, a finding that affects many disciplines, including history.<ref>{{Cite journal |last1=Cumberledge |first1=Aaron |last2=Smith |first2=Neal |last3=Riley |first3=Benjamin W. |date=2023-08-01 |title=Unverified history: an analysis of quotation accuracy in leading history journals |url=https://doi.org/10.1007/s11192-023-04755-w |journal=Scientometrics |language=en |volume=128 |issue=8 |pages=4677–4687 |doi=10.1007/s11192-023-04755-w |s2cid=259519993 |issn=1588-2861}}</ref> | |||
==References == | |||
<div class="references-small"> | |||
* American Society of Mechanical Engineers. . Retrieved on February 8, 2008. | |||
* Brigham Young University (2008). . Retrieved on February 8, 2008. | |||
*<cite id=refCaliforniaStateUni>{{cite web | |||
| author = California State University | |||
| year = 2007 | |||
| title = Citation Formats & Style Manuals | |||
| url = http://www.csuchico.edu/lref/newciting.html | |||
| work = Meriam Library ReSEARCH Station | |||
| publisher = California State University, Chico | |||
| accessdate = 2008-02-11 | |||
}}</cite> | |||
*<cite id=refColoradoUni>{{cite web | |||
| author = Colorado State University | |||
| year = 2008 | |||
| title = CBE - Council of Biology Editors (Citation/Sequence System) | |||
| url = http://writing.colostate.edu/guides/researchsources/documentation/cbe_citation/index.cfm | |||
| work = Writing Guides | |||
| publisher = Colorado State University | |||
| accessdate = 2008-02-11 | |||
}}</cite> | |||
*<cite id=refDukeUni>{{cite web | |||
| author = Duke University | |||
| year = 2007 | |||
| title = Book with a Single Author | |||
| url = http://library.duke.edu/research/citing/workscited/booksingle.html | |||
| work = | |||
| publisher = Duke University Libraries | |||
| accessdate = 2008-02-04 | |||
}}</cite> | |||
* ] (2007). . Retrieved on February 8, 2008. | |||
*<cite id=refLesleyUni>{{cite web | |||
| author = Lesley University | |||
| title = APA Citation Format | |||
| url = http://www.lesley.edu/library/guides/citation/apa.html | |||
| work = Lesley University Library | |||
| publisher = Lesley University | |||
| accessdate = 2008-02-11 | |||
}}</cite> | |||
*<cite id=refLongIslandUni>{{cite web | |||
| author = Long Island University | |||
| title = Anatomy of a Citation | |||
| url = http://www.liunet.edu/cwis/cwp/library/workbook/evaluate.htm#citing | |||
| work = Library Workshop Manual : Section 4 | |||
| publisher = Long Island University | |||
| accessdate = 2008-02-03 | |||
}}</cite> | |||
*<cite id=refMartin2007>{{cite web | |||
| author = Martin, Peter W. | |||
| year = 2007 | |||
| title = Introduction to Basic Legal Citation (LII 2007 ed.) | |||
| url = http://www.law.cornell.edu/citation/ | |||
| publisher = Cornell University Law School | |||
| accessdate = 2008-02-03 | |||
}}</cite> | |||
* Modern Humanities Research Association (2007). . Retrieved on February 8, 2008. | |||
* Pechenik, Jan A. (2003). ''A Short Guide to Writing About Biology'', fifth edition, Longman. ISBN 0321159810 | |||
*<cite id=refRIT>{{cite web | |||
| author = Rochester Institute of Technology | |||
| year = 2003 | |||
| title = APA Citation Format | |||
| url = http://wally.rit.edu/pubs/guides/apa.html | |||
| work = RIT Libraries | |||
| publisher = Rochester Institute of Technology | |||
| accessdate = 2008-02-11 | |||
}}</cite> | |||
*<cite id=refUCBerkeley>{{cite web | |||
| author = University of California Berkeley | |||
| year = 2006 | |||
| title = ACS (American Chemical Society) Style Guidelines Quick Guide | |||
| url = http://www.lib.berkeley.edu/CHEM/acsstyle.html | |||
| work = Chemistry and Chemical Engineering Library | |||
| publisher = UC Berkeley Library | |||
| accessdate = 2008-02-03 | |||
}}</cite> | |||
*<cite id=refUniMaryland>{{cite web | |||
| author = University of Maryland | |||
| year = 2006 | |||
| title = Citation Systems and Style Manuals | |||
| url = http://www.lib.umd.edu/guides/style_manuals.html | |||
| work = Research and Library Skills | |||
| publisher = University of Maryland,University Libraries | |||
| accessdate = 2008-02-11 | |||
}}</cite> | |||
*<cite id=refYaleUni>{{cite web | |||
| author = Yale University | |||
| year = 2008 | |||
| title = Why Are There Different Citation Styles? | |||
| url = http://www.yale.edu/bass/writing/sources/kinds/principles/why.html | |||
| work = Writing at Yale / Using Sources | |||
| publisher = Yale University | |||
| accessdate = 2008-02-11 | |||
}}</cite> | |||
</div> | |||
Research suggests the impact of an article can be, partly, explained by superficial factors and not only by the scientific merits of an article.<ref>Bornmann, L., & Daniel, H. D. (2008). What do citation counts measure? A review of studies on citing behavior. Journal of Documentation, 64(1), 45–80.</ref> Field-dependent factors are usually listed as an issue to be tackled not only when comparisons across disciplines are made, but also when different fields of research of one discipline are being compared.<ref>{{Cite journal |last1=Anauati |first1=Maria Victoria |last2=Galiani |first2=Sebastian |last3=Gálvez |first3=Ramiro H. |date=November 4, 2015 |title=Quantifying the Life Cycle of Scholarly Articles Across Fields of Economic Research |ssrn=2523078 |journal=Economic Inquiry |volume=52 |issue=2 |pages=1339–1355}}</ref> For example, in medicine, among other factors, the number of authors, the number of references, the article length, and the presence of a colon in the title influence the impact; while in sociology the number of references, the article length, and title length are among the factors.<ref>{{Cite journal |last1=van Wesel |first1=M. |last2=Wyatt |first2=S. |last3=ten Haaf |first3=J. |year=2014 |title=What a difference a colon makes: how superficial factors influence subsequent citation |url=https://pure.knaw.nl/ws/files/894334/art_3A10.1007_2Fs11192_013_1154_x.pdf |journal=Scientometrics |volume=98 |issue=3 |pages=1601–1615 |doi=10.1007/s11192-013-1154-x |s2cid=18553863 |hdl=20.500.11755/2fd7fc12-1766-4ddd-8f19-1d2603d2e11d |hdl-access=free |access-date=2019-07-11 |archive-date=2021-01-26 |archive-url=https://web.archive.org/web/20210126035317/https://pure.knaw.nl/ws/files/894334/art_3A10.1007_2Fs11192_013_1154_x.pdf |url-status=live }}</ref> | |||
==Further reading== | |||
<div class="references-2column"> | |||
;Guidelines | |||
*, ''Turnitin.com''. | |||
*, University of North Texas Libraries. | |||
* | |||
* | |||
* | |||
*, and the ] package. | |||
* | |||
Studies of methodological quality and reliability have found that "reliability of published research works in several fields may be decreasing with increasing journal rank".<ref name="Brembs2018">{{cite journal |last1=Brembs|first1=Björn|title=Prestigious Science Journals Struggle to Reach Even Average Reliability |journal=Frontiers in Human Neuroscience |volume=12 |page=37 |year=2018 |pmid=29515380 |pmc=5826185 |doi=10.3389/fnhum.2018.00037 |doi-access=free}}</ref> ] recognizes that citations remain a controversial and yet important metric for academics.<ref>{{Cite web |url=https://go.nature.com/2TdWoM6 |title=Studies suggest 5 ways to increase citation counts |last=Crew |first=Bec |date=7 August 2019 |website=] Index |access-date=20 August 2019 |archive-date=18 February 2022 |archive-url=https://web.archive.org/web/20220218015207/https://www.natureindex.com/news-blog/studies-research-five-ways-increase-citation-counts |url-status=live }}</ref> They report five ways to increase citation counts: (1) watch the title length and punctuation;<ref>{{Cite journal |last=Hudson |first=John |year=2016 |title=An analysis of the titles of papers submitted to the UK REF in 2014: authors, disciplines, and stylistic details |journal=] |volume=109 |issue=2 |pages=871–889 |doi=10.1007/s11192-016-2081-4 |pmc=5065898 |pmid=27795594}}</ref> (2) release the results early as preprints;<ref>{{Cite bioRxiv |biorxiv=10.1101/673665 |first1=Nicholas |last1=Fraser |first2=Fakhri |last2=Momeni |title=The effect of bioRxiv preprints on citations and altmetrics |first3=Philipp |last3=Mayr |first4=Isabell |last4=Peters |year=2019}}</ref> (3) avoid referring to a country in the title, abstract, or keywords;<ref>{{Cite journal |last1=Abramo |first1=Giovanni |last2=D'Angelo |first2=Ciriaco Andrea |last3=Di Costa |first3=Flavia |year=2016 |title=The effect of a country's name in the title of a publication on its visibility and citability |journal=] |volume=109 |issue=3 |pages=1895–1909 |arxiv=1810.12657 |doi=10.1007/s11192-016-2120-1|s2cid=4354082 }}</ref> (4) link the article to supporting data in a repository;<ref>{{Cite journal|arxiv=1907.02565 |first1=Giovanni |last1=Colavizza |first2=Iain |last2=Hrynaszkiewicz |title=The citation advantage of linking publications to research data |first3=Isla |last3=Staden |first4=Kirstie |last4=Whitaker |first5=Barbara |last5=McGillivray |journal=PLOS ONE |year=2019|volume=15 |issue=4 |pages=e0230416 |doi=10.1371/journal.pone.0230416 |pmid=32320428 |pmc=7176083 |bibcode=2020PLoSO..1530416C |doi-access=free }}</ref> and (5) avoid hyphens in the titles of research articles.<ref>{{Cite journal |last1=Zhou |first1=Zhi Quan |last2=Tse |first2=T.H. |last3=Witheridge |first3=Matt |year=2021 |title=Metamorphic robustness testing: Exposing hidden defects in citation statistics and journal impact factors |journal=] |volume=47 |issue=6 |pages=1164–1183 |doi=10.1109/TSE.2019.2915065|doi-access=free }}</ref> | |||
;Examples | |||
*, generated using ], of several major styles, including more than those listed above. | |||
*PDF file illustrates how several bibliographic styles appear with citations and reference entries, generated using ]. | |||
Citation patterns are also known to be affected by unethical behavior of both the authors and journal staff. Such behavior is called impact factor boosting and was reported to involve even the top-tier journals. Specifically the high-ranking journals of medical science, including ''The Lancet'', ''JAMA'' and ''The New England Journal of Medicine'', are thought to be associated with such behavior, with up to 30% of citations to these journals being generated by commissioned opinion articles.<ref>{{Cite journal |last=Heneberg |first=P. |year=2014 |title=Parallel Worlds of Citable Documents and Others: Inflated Commissioned Opinion Articles Enhance Scientometric Indicators |journal=Journal of the Association for Information Science and Technology |volume=65 |issue=3 |page=635 |doi=10.1002/asi.22997 |s2cid=3165853 |url=https://asistdl.onlinelibrary.wiley.com/doi/abs/10.1002/asi.22997 |url-access=subscription |access-date=2021-06-20 |archive-date=2021-06-24 |archive-url=https://web.archive.org/web/20210624202227/https://asistdl.onlinelibrary.wiley.com/doi/abs/10.1002/asi.22997 |url-status=live }}</ref> On the other hand, the phenomenon of citation cartels is rising. Citation cartels are defined as groups of authors that cite each other disproportionately more than they do other groups of authors who work on the same subject.<ref>{{Cite journal |last1=Fister |first1=I. Jr. |last2=Fister |first2=I. |last3=Perc |first3=M. |year=2016 |title=Toward the Discovery of Citation Cartels in Citation Networks |journal=Frontiers in Physics |volume=4 |pages=49 |bibcode=2016FrP.....4...49F |doi=10.3389/fphy.2016.00049 |doi-access=free}}</ref> | |||
;Style guides | |||
* | |||
==Research and development== | |||
* Swarthmore library's Guide to Citation Styles for and . | |||
There is research about citations and development of related tools and systems, mainly relating to scientific citations. ] is a method widely used in ]. | |||
</div> | |||
===Citation analysis=== | |||
{{Excerpt|Citation analysis|only=paragraphs|paragraphs=1-2}} | |||
===Citation frequency=== | |||
{{See also|Metascience#Evaluation and incentives}} | |||
{{Excerpt|Scientific citation|Citation frequency|hat=no}} | |||
===Progress and citation consolidation=== | |||
{{Excerpt|Scientific citation|Progress and citation consolidation|hat=no}} | |||
===IT systems=== | |||
{{Excerpt|Scientific citation|IT systems|subsections=yes|hat=no}} | |||
== See also == | |||
<!-- New links in alpphabetial order please --> | |||
{{columns-list|colwidth=30em| | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
}} | |||
== Notes == | |||
{{Notelist}} | |||
== References == | |||
{{Reflist}} | |||
== Further reading == | |||
* {{Wiktionary-inline}} | |||
* {{Wikiquote-inline}} | |||
*{{commonscatinline}} | |||
<!-- This list needs to be ordered alphabetically. --> | |||
{{refbegin}} | |||
* {{Cite journal |last=Armstrong |first=J Scott |date=July 1996 |title=The Ombudsman: Management Folklore and Management Science{{snd}}On Portfolio Planning, Escalation Bias, and Such |url=https://repository.upenn.edu/cgi/viewcontent.cgi?article=1111&context=marketing_papers |journal=Interfaces |volume=26 |issue=4 |pages=28–42 |doi=10.1287/inte.26.4.25 |oclc=210941768 |ref=refArmstrong 2007 |access-date=2019-07-11 |archive-date=2018-07-20 |archive-url=https://web.archive.org/web/20180720064706/https://repository.upenn.edu/cgi/viewcontent.cgi?article=1111&context=marketing_papers |url-status=live }} | |||
* <cite id=refPechenik2004>{{Cite book |last=Pechenik |first=Jan A |title=A Short Guide to Writing About Biology |publisher=Pearson/Longman |year=2004 |isbn=978-0-321-15981-6 |edition=5th |location=] |oclc=52166026 |ref=refMHRA}}</cite> | |||
* {{Cite web |url=http://ctl.yale.edu/writing/using-sources/why-are-there-different-citation-styles |title=Why Are There Different Citation Styles? |year=2008 |website=Yale.edu |access-date=2015-09-28 |ref=refYaleUni |archive-date=2015-08-27 |archive-url=https://web.archive.org/web/20150827212624/http://ctl.yale.edu/writing/using-sources/why-are-there-different-citation-styles |url-status=live }} | |||
{{refend}} | |||
{{Authority control}} | |||
] | ] | ||
] | |||
] | ] | ||
] | |||
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Latest revision as of 14:52, 20 December 2024
Reference to a source For "<cite>", see HTML element § cite. For other uses, see Citation (disambiguation), Cité (disambiguation), and CITE (disambiguation). For help making citations within Misplaced Pages, see Misplaced Pages:Citing sources. For help citing Misplaced Pages in external sources, see Misplaced Pages:Citing Misplaced Pages.Part of a series on |
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A citation is a reference to a source. More precisely, a citation is an abbreviated alphanumeric expression embedded in the body of an intellectual work that denotes an entry in the bibliographic references section of the work for the purpose of acknowledging the relevance of the works of others to the topic of discussion at the spot where the citation appears.
Generally, the combination of both the in-body citation and the bibliographic entry constitutes what is commonly thought of as a citation (whereas bibliographic entries by themselves are not).
Citations have several important purposes. While their uses for upholding intellectual honesty and bolstering claims are typically foregrounded in teaching materials and style guides (e.g.,), correct attribution of insights to previous sources is just one of these purposes. Linguistic analysis of citation-practices has indicated that they also serve critical roles in orchestrating the state of knowledge on a particular topic, identifying gaps in the existing knowledge that should be filled or describing areas where inquiries should be continued or replicated. Citation has also been identified as a critical means by which researchers establish stance: aligning themselves with or against subgroups of fellow researchers working on similar projects and staking out opportunities for creating new knowledge.
Conventions of citation (e.g., placement of dates within parentheses, superscripted endnotes vs. footnotes, colons or commas for page numbers, etc.) vary by the citation-system used (e.g., Oxford, Harvard, MLA, NLM, American Sociological Association (ASA), American Psychological Association (APA), etc.). Each system is associated with different academic disciplines, and academic journals associated with these disciplines maintain the relevant citational style by recommending and adhering to the relevant style guides.
Concept
A bibliographic citation is a reference to a book, article, web page, or other published item. Citations should supply sufficient detail to identify the item uniquely. Different citation systems and styles are used in scientific citation, legal citation, prior art, the arts, and the humanities. Regarding the use of citations in the scientific literature, some scholars also put forward "the right to refuse unwanted citations" in certain situations deemed inappropriate.
Content
Citation content can vary depending on the type of source and may include:
- Book: authors, book title, place of publication, publisher, date of publication, and page numbers if appropriate.
- Journal: authors, article title, journal title, date of publication, and page numbers.
- Newspaper: authors, article title, name of newspaper, section title and page numbers if desired, date of publication.
- Web site: authors, article, and publication title where appropriate, as well as a URL, and a date when the site was accessed.
- Play: inline citations offer part, scene, and line numbers, the latter separated by periods: 4.452 refers to scene 4, line 452. For example, "In Eugene Onegin, Onegin rejects Tanya when she is free to be his, and only decides he wants her when she is already married" (Pushkin 4.452–53).
- Poem: spaced slashes are normally used to indicate separate lines of a poem, and parenthetical citations usually include the line numbers. For example: "For I must love because I live / And life in me is what you give." (Brennan, lines 15–16).
- Interview: name of interviewer, interview descriptor (ex. personal interview), and date of interview.
- Data: authors, dataset title, date of publication, and publisher.
Unique identifiers
Along with information such as authors, date of publication, title and page numbers, citations may also include unique identifiers depending on the type of work being referred to.
- Citations of books may include an International Standard Book Number (ISBN).
- Specific volumes, articles, or other identifiable parts of a periodical, may have an associated Serial Item and Contribution Identifier (SICI) or an International Standard Serial Number (ISSN).
- Electronic documents may have a digital object identifier (DOI).
- Biomedical research articles may have a PubMed Identifier (PMID).
Systems
Broadly speaking, there are two types of citation systems, the Vancouver system and parenthetical referencing. However, the Council of Science Editors (CSE) adds a third, the citation-name system.
Vancouver system
Main article: Vancouver systemThe Vancouver system uses sequential numbers in the text, either bracketed or superscript or both. The numbers refer to either footnotes (notes at the end of the page) or endnotes (notes on a page at the end of the paper) that provide source detail. The notes system may or may not require a full bibliography, depending on whether the writer has used a full-note form or a shortened-note form. The organizational logic of the bibliography is that sources are listed in their order of appearance in-text, rather than alphabetically by author last name.
For example, an excerpt from the text of a paper using a notes system without a full bibliography could look like:
- "The five stages of grief are denial, anger, bargaining, depression, and acceptance."
The note, located either at the foot of the page (footnote) or at the end of the paper (endnote) would look like this:
- 1. Elisabeth Kübler-Ross, On Death and Dying (New York: Macmillan, 1969) 45–60.
In a paper with a full bibliography, the shortened note might look like:
- 1. Kübler-Ross, On Death and Dying 45–60.
The bibliography entry, which is required with a shortened note, would look like this:
- Kübler-Ross, Elisabeth. On Death and Dying. New York: Macmillan, 1969.
In the humanities, many authors also use footnotes or endnotes to supply anecdotal information. In this way, what looks like a citation is actually supplementary material, or suggestions for further reading.
Parenthetical referencing
Main article: Parenthetical referencingParenthetical referencing, also known as Harvard referencing, has full or partial, in-text, citations enclosed in circular brackets and embedded in the paragraph.
An example of a parenthetical reference:
- "The five stages of grief are denial, anger, bargaining, depression, and acceptance" (Kübler-Ross, 1969, pp. 45–60).
Depending on the choice of style, fully cited parenthetical references may require no end section. Other styles include a list of the citations, with complete bibliographical references, in an end section, sorted alphabetically by author. This section is often called "References", "Bibliography", "Works cited" or "Works consulted".
In-text references for online publications may differ from conventional parenthetical referencing. A full reference can be hidden, only displayed when wanted by the reader, in the form of a tooltip. This style makes citing easier and improves the reader's experience.
Styles
APA style, The Chicago Manual of Style, Bluebook, MLA style, and ASA styleCitation styles can be broadly divided into styles common to the humanities and the sciences, though there is considerable overlap. Some style guides, such as the Chicago Manual of Style, are quite flexible and cover both parenthetical and note citation systems. Others, such as MLA and APA styles, specify formats within the context of a single citation system. These may be referred to as citation formats as well as citation styles. The various guides thus specify order of appearance, for example, of publication date, title, and page numbers following the author name, in addition to conventions of punctuation, use of italics, emphasis, parenthesis, quotation marks, etc., particular to their style.
A number of organizations have created styles to fit their needs; consequently, a number of different guides exist. Individual publishers often have their own in-house variations as well, and some works are so long-established as to have their own citation methods too: Stephanus pagination for Plato; Bekker numbers for Aristotle; citing the Bible by book, chapter and verse; or Shakespeare notation by play.
The Citation Style Language (CSL) is an open XML-based language to describe the formatting of citations and bibliographies.
Humanities
- The Chicago style (CMOS) was developed and its guide is The Chicago Manual of Style. It is most widely used in history and economics as well as some social sciences. The closely related Turabian style—which derives from it—is for student references, and is distinguished from the CMOS by omission of quotation marks in reference lists, and mandatory access date citation.
- The Columbia style was created by Janice R. Walker and Todd Taylor to give detailed guidelines for citing internet sources. Columbia style offers models for both the humanities and the sciences.
- Evidence Explained: Citing History Sources from Artifacts to Cyberspace by Elizabeth Shown Mills covers primary sources not included in CMOS, such as censuses, court, land, government, business, and church records. Includes sources in electronic format. Used by genealogists and historians.
- Harvard referencing (or author-date system) is a specific kind of parenthetical referencing. Parenthetical referencing is recommended by both the British Standards Institution and the Modern Language Association. Harvard referencing involves a short author-date reference, e.g., "(Smith, 2000)", being inserted after the cited text within parentheses and the full reference to the source being listed at the end of the article.
- MLA style was developed by the Modern Language Association and is most often used in the arts and the humanities, particularly in English studies, other literary studies, including comparative literature and literary criticism in languages other than English ("foreign languages"), and some interdisciplinary studies, such as cultural studies, drama and theatre, film, and other media, including television. This style of citations and bibliographical format uses parenthetical referencing with author-page (Smith 395) or author- title-page (Smith, Contingencies 42) in the case of more than one work by the same author within parentheses in the text, keyed to an alphabetical list of sources on a "works cited" page at the end of the paper, as well as notes (footnotes or endnotes).
- The MHRA Style Guide is published by the Modern Humanities Research Association (MHRA) and most widely used in the arts and humanities in the United Kingdom, where the MHRA is based. It is available for sale both in the UK and in the United States. It is similar to MLA style, but has some differences. For example, MHRA style uses footnotes that reference a citation fully while also providing a bibliography. Some readers find it advantageous that the footnotes provide full citations, instead of shortened references, so that they do not need to consult the bibliography while reading for the rest of the publication details.
In some areas of the humanities, footnotes are used exclusively for references, and their use for conventional footnotes (explanations or examples) is avoided. In these areas, the term footnote is actually used as a synonym for reference, and care must be taken by editors and typesetters to ensure that they understand how the term is being used by their authors.
Law
Main article: Legal citation- The Bluebook is a citation system traditionally used in American academic legal writing, and the Bluebook (or similar systems derived from it) are used by many courts. At present, academic legal articles are always footnoted, but motions submitted to courts and court opinions traditionally use inline citations, which are either separate sentences or separate clauses. Inline citations allow readers to quickly determine the strength of a source based on, for example, the court a case was decided in and the year it was decided.
- The legal citation style used almost universally in Canada is based on the Canadian Guide to Uniform Legal Citation (AKA McGill Guide), published by McGill Law Journal.
- British legal citation almost universally follows the Oxford Standard for Citation of Legal Authorities (OSCOLA).
Sciences, mathematics, engineering, physiology, and medicine
- The American Chemical Society style, or ACS style, is often used in chemistry and some of the physical sciences. In ACS style references are numbered in the text and in the reference list, and numbers are repeated throughout the text as needed.
- In the style of the American Institute of Physics (AIP style), references are also numbered in the text and in the reference list, with numbers repeated throughout the text as needed.
- Styles developed for the American Mathematical Society (AMS), or AMS styles, such as AMS-LaTeX, are typically implemented using the BibTeX tool in the LaTeX typesetting environment. Brackets with the author's initials and year are inserted in the text and at the beginning of the reference. Typical citations are listed in line with alphabetic-label format, e.g. . This type of style is also called an "authorship trigraph".
- The Vancouver system, recommended by the Council of Science Editors (CSE), is used in medical and scientific papers and research.
- In one major variant, that used by the American Society of Mechanical Engineers (ASME), citation numbers are included in the text in square brackets rather than as superscripts. All bibliographical information is exclusively included in the list of references at the end of the document, next to the respective citation number.
- The International Committee of Medical Journal Editors (ICMJE) is reportedly the original kernel of this biomedical style, which evolved from the Vancouver 1978 editors' meeting. The MEDLINE/PubMed database uses this citation style and the National Library of Medicine provides "ICMJE Uniform Requirements for Manuscripts Submitted to Biomedical Journals – Sample References".
- The American Medical Association has its own variant of Vancouver style with only minor differences. See AMA Manual of Style.
- The style of the Institute of Electrical and Electronics Engineers (IEEE), or IEEE style, encloses citation numbers within square brackets and numbers them consecutively, with numbers repeated throughout the text as needed.
- In areas of biology that falls within the ICNafp (which itself uses this citation style throughout), a variant form of author-title citation is the primary method used when making nomenclatural citations and sometimes general citations (for example in code-related proposals published in Taxon), with the works in question not cited in the bibliography unless also cited in the text. Titles use standardized abbreviations following Botanico-Periodicum-Huntianum for periodicals and Taxonomic Literature 2 (later IPNI) for books.
- Pechenik citation style is a style described in A Short Guide to Writing about Biology, 6th ed. (2007), by Jan A. Pechenik.
- In 1955, Eugene Garfield proposed a bibliographic system for scientific literature, to consolidate the integrity of scientific publications.
Social sciences
- The style of the American Psychological Association, or APA style, published in the Publication Manual of the American Psychological Association, is most often used in social sciences. APA citation style is similar to Harvard referencing, listing the author's name and year of publication, although these can take two forms: name citations in which the surnames of the authors appear in the text and the year of publication then appears in parentheses, and author-date citations, in which the surnames of the authors and the year of publication all appear in parentheses. In both cases, in-text citations point to an alphabetical list of sources at the end of the paper in a "references" section.
- The American Political Science Association publishes both a style manual and a style guide for publications in this field. The style is close to the CMOS.
- The American Anthropological Association utilizes a modified form of the Chicago style laid out in their publishing style guide.
- The ASA style of the American Sociological Association is one of the main styles used in sociological publications.
Issues
See also: Impact factor § Editorial policies that affect the impact factorIn their research on footnotes in scholarly journals in the field of communication, Michael Bugeja and Daniela V. Dimitrova have found that citations to online sources have a rate of decay (as cited pages are taken down), which they call a "half-life", that renders footnotes in those journals less useful for scholarship over time.
Other experts have found that published replications do not have as many citations as original publications.
Another important issue is citation errors, which often occur due to carelessness on either the researcher or journal editor's part in the publication procedure. For example, a study that analyzed 1,200 randomly selected citations from three major business ethics journals concluded that an average article contains at least three plagiarized citations when authors copy and paste a citation entry from another publication without consulting the original source. Experts have found that simple precautions, such as consulting the author of a cited source about proper citations, reduce the likelihood of citation errors and thus increase the quality of research. Another study noted that approximately 25% citations do not support the claims made, a finding that affects many disciplines, including history.
Research suggests the impact of an article can be, partly, explained by superficial factors and not only by the scientific merits of an article. Field-dependent factors are usually listed as an issue to be tackled not only when comparisons across disciplines are made, but also when different fields of research of one discipline are being compared. For example, in medicine, among other factors, the number of authors, the number of references, the article length, and the presence of a colon in the title influence the impact; while in sociology the number of references, the article length, and title length are among the factors.
Studies of methodological quality and reliability have found that "reliability of published research works in several fields may be decreasing with increasing journal rank". Nature Index recognizes that citations remain a controversial and yet important metric for academics. They report five ways to increase citation counts: (1) watch the title length and punctuation; (2) release the results early as preprints; (3) avoid referring to a country in the title, abstract, or keywords; (4) link the article to supporting data in a repository; and (5) avoid hyphens in the titles of research articles.
Citation patterns are also known to be affected by unethical behavior of both the authors and journal staff. Such behavior is called impact factor boosting and was reported to involve even the top-tier journals. Specifically the high-ranking journals of medical science, including The Lancet, JAMA and The New England Journal of Medicine, are thought to be associated with such behavior, with up to 30% of citations to these journals being generated by commissioned opinion articles. On the other hand, the phenomenon of citation cartels is rising. Citation cartels are defined as groups of authors that cite each other disproportionately more than they do other groups of authors who work on the same subject.
Research and development
There is research about citations and development of related tools and systems, mainly relating to scientific citations. Citation analysis is a method widely used in metascience.
Citation analysis
These paragraphs are an excerpt from Citation analysis.Citation analysis is the examination of the frequency, patterns, and graphs of citations in documents. It uses the directed graph of citations — links from one document to another document — to reveal properties of the documents. A typical aim would be to identify the most important documents in a collection. A classic example is that of the citations between academic articles and books. For another example, judges of law support their judgements by referring back to judgements made in earlier cases (see citation analysis in a legal context). An additional example is provided by patents which contain prior art, citation of earlier patents relevant to the current claim. The digitization of patent data and increasing computing power have led to a community of practice that uses these citation data to measure innovation attributes, trace knowledge flows, and map innovation networks.
Documents can be associated with many other features in addition to citations, such as authors, publishers, journals as well as their actual texts. The general analysis of collections of documents is known as bibliometrics and citation analysis is a key part of that field. For example, bibliographic coupling and co-citation are association measures based on citation analysis (shared citations or shared references). The citations in a collection of documents can also be represented in forms such as a citation graph, as pointed out by Derek J. de Solla Price in his 1965 article "Networks of Scientific Papers". This means that citation analysis draws on aspects of social network analysis and network science.Citation frequency
See also: Metascience § Evaluation and incentivesModern scientists are sometimes judged by the number of times their work is cited by others—this is actually a key indicator of the relative importance of a work in science. Accordingly, individual scientists are motivated to have their own work cited early and often and as widely as possible, but all other scientists are motivated to eliminate unnecessary citations so as not to devalue this means of judgment. A formal citation index tracks which referred and reviewed papers have referred which other such papers. Baruch Lev and other advocates of accounting reform consider the number of times a patent is cited to be a significant metric of its quality, and thus of innovation. Reviews often replace citations to primary studies.
Citation-frequency is one indicator used in scientometrics.Progress and citation consolidation
Two metascientists reported that in a growing scientific field, citations disproportionately cite already well-cited papers, possibly slowing and inhibiting canonical progress to some degree in some cases. They find that "structures fostering disruptive scholarship and focusing attention on novel ideas" could be important.
Other metascientists introduced the 'CD index' intended to characterize "how papers and patents change networks of citations in science and technology" and reported that it has declined, which they interpreted as "slowing rates of disruption". They proposed linking this to changes to three "use of previous knowledge"-indicators which they interpreted as "contemporary discovery and invention" being informed by "a narrower scope of existing knowledge". The overall number of papers has risen while the total of "highly disruptive" papers has not. The 1998 discovery of the accelerating expansion of the universe has a CD index of 0. Their results also suggest scientists and inventors "may be struggling to keep up with the pace of knowledge expansion".IT systems
Research discovery
Recommendation systems sometimes also use citations to find similar studies to the one the user is currently reading or that the user may be interested in and may find useful. Better availability of integrable open citation information could be useful in addressing the "overwhelming amount of scientific literature".
Q&A agents
Knowledge agents may use citations to find studies that are relevant to the user's query, in particular citation statements are used by scite.ai to answer a question, also providing the associated reference(s).
Misplaced Pages
There have been analyses of citations of science information on Misplaced Pages or of scientific citations on the site, e.g. enabling listing the most relevant or most-cited scientific journals and categories and dominant domains. Since 2015, the altmetrics platform Altmetric.com also shows citing English Misplaced Pages articles for a given study, later adding other language editions. The Wikimedia platform under development Scholia also shows "Misplaced Pages mentions" of scientific works. A study suggests a citation on Misplaced Pages "could be considered a public parallel to scholarly citation". A scientific publication being "cited in a Misplaced Pages article is considered an indicator of some form of impact for this publication" and it may be possible to detect certain publications through changes to Misplaced Pages articles. Wikimedia Research's Cite-o-Meter tool showed a league table of which academic publishers are most cited on Misplaced Pages as does a page by the "Academic Journals WikiProject". Research indicates a large share of academic citations on the platform are paywalled and hence inaccessible to many readers. "" is a tag added by Misplaced Pages editors to unsourced statements in articles requesting citations to be added. The phrase is reflective of the policies of verifiability and no original research on Misplaced Pages and has become a general Internet meme.
Differentiation of semantic citation contexts
The tool scite.ai tracks and links citations of papers as 'Supporting', 'Mentioning', or 'Contrasting' the study, differentiating between these contexts of citations to some degree which may be useful for evaluation/metrics and e.g. discovering studies or statements contrasting statements within a specific study.
Retractions
The Scite Reference Check bot is an extension of scite.ai that scans new article PDFs "for references to retracted papers, and posts both the citing and retracted papers on Twitter" and also "flags when new studies cite older ones that have issued corrections, errata, withdrawals, or expressions of concern". Studies have suggested as few as 4% of citations to retracted papers clearly recognize the retraction. Research found "that authors tend to keep citing retracted papers long after they have been red flagged, although at a lower rate".See also
- Acknowledgment (creative arts)
- Bible citation
- Case citation
- Citation creator
- Citation index
- Citation signal
- Citationality
- Coercive citation
- Credit (creative arts)
- Cross-reference
- San Francisco Declaration on Research Assessment
- Scholarly method
- Source evaluation
- Style guide
Notes
- The field of communication (or communications) overlaps with some of the disciplines also covered by the MLA and has its own disciplinary style recommendations for documentation format; the style guide recommended for use in student papers in such departments in American colleges and universities is often The Publication Manual of the APA (American Psychological Association); designated for short as "APA style".
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Further reading
- The dictionary definition of citation at Wiktionary
- Quotations related to Citation at Wikiquote
- Media related to Citations at Wikimedia Commons
- Armstrong, J Scott (July 1996). "The Ombudsman: Management Folklore and Management Science – On Portfolio Planning, Escalation Bias, and Such". Interfaces. 26 (4): 28–42. doi:10.1287/inte.26.4.25. OCLC 210941768. Archived from the original on 2018-07-20. Retrieved 2019-07-11.
- Pechenik, Jan A (2004). A Short Guide to Writing About Biology (5th ed.). New York: Pearson/Longman. ISBN 978-0-321-15981-6. OCLC 52166026.
- "Why Are There Different Citation Styles?". Yale.edu. 2008. Archived from the original on 2015-08-27. Retrieved 2015-09-28.