Nowak, M., and K. Szybiga. “MILK MARKET IN THE CONTEXT OF CITIES SUPPLY ON LOWER SILESIA”. Acta Scientiarum Polonorum. Oeconomia, Vol. 7, no. 3, Sept. 2008, pp. 81-88, https://js.wne.sggw.pl/index.php/aspe/article/view/3789.