Oromo Democracy: An Indigenous African Political System
by Asmarom Legesse
Jimma Abba Jifar: An Oromo Monarchy Ethiopia 1830-1932 With a Post-Script
by Herbert S. Lewis
Being Oromo in Kenya
by Mario I. Aguilar (Hardcover - June 1998)
The Oromo in Exile
by Greg Gow (Paperback - September 2002)
Geerarsa Folksong As the Oromo National Literature:
A Study of Ethnography, Folklore, and Folklife in the
Context of the Ethiopian Colonization of Oromia
(Studies in African Literature (Lewiston, N.Y.), V. 6.)
by Addisu Tolesa
A Grammar of Harar Oromo (Northeastern Ethiopia)
by Jonathan Owens (Paperback - December 1985)