Mickiewicz, Antoni, and Bogdan Wawrzyniak. “Directions of Development of the Support System for Agricultural Producer Groups”. Journal of Agribusiness and Rural Development 20, no. 2 (December 31, 2011): 103-113. Accessed June 29, 2022. http://www1.up.poznan.pl/jard/index.php/jard/article/view/725.