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2. balfour-Paul, H.G.: History and antiquities of Darfur. Sudan Antiquities Museum Pamphlet 3 (1955)
3. Barbour, K.M.: The Republic of the Sudan: A regional geography. University of London Press. London 1961.
4. United Nations: Land and water resources survey in the Jebel Marra area, the Sudan. Final Report. FAO/SF: 48/SUD-17. Rome 1968.
5. Fisher, A.G.B.: Gustav Nachtigal, Sahara and Sudan, II, Wadai and Darfur. C. Hurst and Co. London 1971.