Food and Agriculture Organization of the United Nations. Land and Water Development Division (1997). Irrigation potential in Africa. Food & Agriculture Org. ص. 92. ISBN:92-5-103966-6. مؤرشف من الأصل في 2020-02-08.
Food and Agriculture Organization of the United Nations. Land and Water Development Division (1997). Irrigation potential in Africa. Food & Agriculture Org. ص. 92. ISBN:92-5-103966-6. مؤرشف من الأصل في 2020-02-08.