1. AzaÏs, R. P., and R. Chambard. 1931. Cinq anneées de recherches archéeologiques en Éthiopie. Librairie Orientaliste, Paul Geunther, Paris.
2. Brooke, Clarke. 1958. The durra complex in the central highlands of Ethiopia. Economic Botany 12:192–204.
3. Clark, J. D.,and A. B. L. Stemler. 1975. Early domesticated sorghum from the central Sudan. Nature 254:588–591.
4. Damon, E. G. 1962. The cultivated sorghums of Ethiopia. Imperial Ethiopian College of Agriculture and Mechanical Arts Experimental Station Bulletin No. 6.
5. Davis, A. J. 1963. The Sixteenth Century Jihad in Ethiopia and the impact of its culture. Part I. Journal of the Historical Society of Nigeria 2:567–592.