"Socioeconomic Aspects of Agroforestry Systems: The Case of Gum-cultivation Cycle" (2025) University of Khartoum Journal of Agricultural Sciences, 18(2). موجود في: https://onlinejournals.uofk.edu/uofkjas/article/view/1958 (تاريخ الوصول: 25 مايو 2026).