Ginter, A., and S. Szarek. “INCOME SITUATION OF STARCH POTATOES PRODUCERS IN POLAND”.
Acta Scientiarum Polonorum. Oeconomia
, Vol. 7, no. 1, Mar. 2008, pp. 83-90, https://js.wne.sggw.pl/index.php/aspe/article/view/3766.