[5] Abadir Abrahim (2003) : Dialectal comparison among Harar and Mecha Oromo: a case study through some selected issues in their phonology, morphology via social context
[3933] Cerulli, Ernesta (1936) : La lingua e la storia di Harar
[16082] Owens, Jonathan (1985) : A grammar of Harar Oromo (Northeastern Ethiopia), including a text and a glossary
[19189] Stroomer, Harry J. (1991) : Dialect divergence in southern Oromo: notes on the Boraana, Orma and Waata lexicon