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According to Ethnologue, there are 11 million speakers of this Oromo form. However, the 1994 Ethiopian national census did not break down language speakers according to dialect, although it reported 2,570,293 speakers of Oromo in those two zones.
Owens, Jonathan. 1985. A grammar of Harar Oromo (Northeastern Ethiopia): including a text and a glossary. Cushitic language studies; Bd. 4) Hamburg: Buske.