Mengistu, F., A. Davtyan, I. Vorster, D. Xuecheng, E. Sembiring, Y. GasmElseed, and A Bashir. “System Approach Problem Diagnosis and Development Strategies for a Competitive Mandarin to Industry in the Karo Highlands, North Sumatra, Indonesia”. Uganda Journal of Agricultural Sciences 9, no. 1 (October 21, 2004): 7–16. Accessed May 10, 2024. http://journal.naro.go.ug/index.php/ujas/article/view/192.