Najda-Janoszka, Marta. “EU ECOLABEL IN TOURISM INDUSTRY”. Acta Scientiarum Polonorum. Oeconomia 9, no. 4 (December 30, 2010): 333-343. Accessed December 23, 2024. https://js.wne.sggw.pl/index.php/aspe/article/view/3961.