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2. Babiker, A.B.: Grundlagen der Entwicklung und Standortverteilung der Industrie in der DR Sudan. Dissertation, Martin Luther universität, Halle 1974.
3. Dept. of Statistics: The handicraft: Industrial Statistical Section, Khartoum 1973.
4. Mefit, S.P.A.: Report on the Southern Region of the Sudan. Rome 1978.
5. Mensching, H. and Ibrahim, F.; The Problem of Desertification in and around Arid Lands. In: Applied Sciences and Development. Vol. 10, Tübingen 1977.