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However, they are not close: Walio and Yawiyo have only a 12% lexical similarity. They are frequently classified among the Sepik languages of northern Papua New Guinea, though Glottolog leaves them out. Glottolog 3.4 classifies the Walio languages as an independent language family.
Ross, Malcolm (2005). "Pronouns as a preliminary diagnostic for grouping Papuan languages". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson (eds.). Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. pp. 15–66. ISBN0858835622. OCLC67292782.
