Zarzecka, K., and M. Gugała. “PROFITABILITY OF DIFFERENT WEED CONTROL METHODS IN POTATO FIELD”. Acta Scientiarum Polonorum. Oeconomia, Vol. 9, no. 3, Sept. 2010, pp. 295-00, https://js.wne.sggw.pl/index.php/aspe/article/view/3929.