Petrick, Martin, Grzegorz Spychalski, Michal Switlyk, and Ewa Tyran. 2002. “Economic Situation and Development Perspectives of Farms in Poland - An Analysis Based on Survey Data from Selected Polish Voivodships and a Comparison With German Farms”. German Journal of Agricultural Economics 51 (4). https://doi.org/10.52825/gjae.v51i4.1516.