Bojarszczuk, J., and J. Księżak. “EVALUATION OF PRODUCTION FACTORS AND THEIR EFFICIENCY IN DAIRY FARMS LOCALIZED IN THREE REGIONS OF LUBELSKIE VOIVODESHIP”. Acta Scientiarum Polonorum. Oeconomia, Vol. 9, no. 2, June 2010, pp. 29-39, https://js.wne.sggw.pl/index.php/aspe/article/view/3882.