Szmidt, K., A. Kasztelan, M. Kierepka, and A. Samborski. “DIVERSIFICATION IN THE INCOME LEVELS OF EU FARM HOLDINGS SPECIALIZING IN THE PRODUCTION OF MILK”. Acta Scientiarum Polonorum. Oeconomia, vol. 15, no. 1, Mar. 2016, pp. 133-4, https://aspe.sggw.edu.pl/article/view/409.