Czudec, Adam, and Dariusz Zając. “Non-Farming Entrepreneurship in the Farm Activity Diversification Process”. Journal of Agribusiness and Rural Development 43, no. 1 (December 31, 2017): 69-78. Accessed February 9, 2025. http://www1.up.poznan.pl/jard/index.php/jard/article/view/87.