Nowogródzka, Teresa, Stanisław Szarek, and Marian Podstawka. 2013. “Subsidies of Agri-Environmental Programs Versus Economical Results in Organic Farm in Poland”. Journal of Agribusiness and Rural Development 29 (3), 101-10. http://www1.up.poznan.pl/jard/index.php/jard/article/view/652.