Smoluk-Sikorska, Joanna, and Władysława Łuczka-Bakuła. 2013. “SALE OF ORGANIC FOOD IN SPECIALIST AND GENERAL RETAIL GROCERY OUTLETS - A COMPARATIVE ANALYSIS”. Acta Scientiarum Polonorum. Oeconomia 12 (1):35-44. https://aspe.sggw.edu.pl/article/view/545.