Ginter, Agnieszka, and Stanisław Szarek. “Income Situation of Cereal Producers on the Example of Wheat Producers”. Journal of Agribusiness and Rural Development 18, no. 4 (December 31, 2010): 29-39. Accessed May 2, 2024. http://www1.up.poznan.pl/jard/index.php/jard/article/view/838.