Klepacki, B., and A. Żelazowska. “THE CHANGES IN LABOUR AND ASSETS RESULTS OF AGRIBUSINESS ENTERPRISES”. Acta Scientiarum Polonorum. Oeconomia, Vol. 3, no. 1, June 2004, pp. 53-62, https://pefim.sggw.pl/index.php/aspe/article/view/3617.