Żelazna, K., and I. Kowalczuk. “CONDITIONS OF POLISH CONSUMERS SHOPPING BEHAVIOR - THE RESULTS OF RESEARCH”. Acta Scientiarum Polonorum. Oeconomia, Vol. 1, no. 1, June 2002, pp. 85-92, https://js.wne.sggw.pl/index.php/aspe/article/view/3588.