Christiansen, Sofus. 1992. “Supplemental Irrigation in the Near East and North Africa: Proceedings of a Workshop on Regional Consultation on Supplemental Irrigation: LcCARDA Snd FAO, Rabat, Marocco, 7-9 December 1987, Ed. By E.R. Perrier and A.B.Salkini”. Geografisk Tidsskrift 92 (januar). https://tidsskrift.dk/geografisktidsskrift/article/view/44890.