Matyja, M. “SOCIAL SIDE OF AGRICULTURAL CO-OPERATIVES. THE CASE OF AGRICULTURAL PRODUCTION CO-OPERATIVES IN THE OPOLE VOIVODESHIP”. Journal of Agribusiness and Rural Development, Vol. 33, no. 3, Dec. 2014, pp. 113-24, http://www1.up.poznan.pl/jard/index.php/jard/article/view/394.