Pepliński, Benedykt, Karol Wajszczuk, and Dariusz Majchrzycki. “The Labour Inputs Analysis in Developing Farms in Their Gross Supply Aspect”. Journal of Agribusiness and Rural Development 1, no. 343 (December 31, 2002): 137-146. Accessed May 5, 2024. http://www1.up.poznan.pl/jard/index.php/jard/article/view/1073.