1. Domestication of the donkey: timing, processes, and indicators;S Rossel;Proc Nat Acad Sci USA,2008
2. Zarins J (1986) Equids associated with human burials in third millennium BC Mesopotamia: Two complementary facets. In: Meadow RH, Uerpmann H-P, editors. Equids in the ancient world. Weisbaden: Ludwig Reichert Verlag. 164–193.
3. A dog and a donkey excavated at Tell Brak;J Clutton-Brock;Iraq,1989
4. Weber JA (2008) Elite equids: Redefining equid burials of the mid-to late 3rd millennium B.C. from Umm el-Marra, Syria. In: Vila E, Gourichon L, Choyke AM, Buitenhuis H, editors. Archaeozoology of the Southwest Asia and Adjacent Areas VIII. Lyon: Maison de l'Orient et de la Mediterranée. 499–519.
5. Horse power: A history of the horse and the donkey in human societies;J Clutton-Brock;London: Natural History Museum,1992