Bombik, A., and K. Rymuza. “ECONOMIC EFFECTIVENESS OF SELECTED TILLAGE COMBINATIONS UTILISED IN EDIBLE POTATO PRODUCTION”. Acta Scientiarum Polonorum. Oeconomia, Vol. 5, no. 1, June 2006, pp. 17-26, https://js.wne.sggw.pl/index.php/aspe/article/view/3694.