Shoko, Roy, Abenet Belete, and Itumeleng Mongale. “Agricultural Supply Response and Price Risk of Maize and Sorghum in South Africa”. Journal of Agribusiness and Rural Development 62, no. 4 (December 28, 2021): 435–445. Accessed April 20, 2024. http://www1.up.poznan.pl/jard/index.php/jard/article/view/1425.