Piwowar, Arkadiusz. “Consumption and Relations of Price Selected Mineral Fertilizers to Wheat Grain”. Journal of Agribusiness and Rural Development 16, no. 2 (December 31, 2010): 101-109. Accessed April 26, 2024. http://www1.up.poznan.pl/jard/index.php/jard/article/view/784.