Ginter, A., H. Kałuża, and I. Soczewka. “Impact of Common Agricultural Policy Reform on the Income Situation of Starch Potato Producers in Poland”. Journal of Agribusiness and Rural Development, Vol. 28, no. 2, Dec. 2013, pp. 53-62, http://www1.up.poznan.pl/jard/index.php/jard/article/view/615.