Mojapelo, Motsipiri, Johannes Hlongwane, and Abenet Belete. “ESTIMATION OF SORGHUM SUPPLY ELASTICITY IN SOUTH AFRICA”. Journal of Agribusiness and Rural Development 52, no. 2 (July 3, 2019): 131–138. Accessed April 10, 2021. http://www1.up.poznan.pl/jard/index.php/jard/article/view/1249.