Nowogródzka, T., S. Szarek, and M. Podstawka. “Subsidies of Agri-Environmental Programs Versus Economical Results in Organic Farm in Poland”. Journal of Agribusiness and Rural Development, Vol. 29, no. 3, Dec. 2013, pp. 101-10, http://www1.up.poznan.pl/jard/index.php/jard/article/view/652.