Zwolińska-Ligaj, Magdalena. 2015. “AREAS OF BUSINESS ACTIVITY IN THE DEVELOPMENT OF ENVIRONMENTALLY VALUABLE ECO-PRODUCTS - AS EXEMPLIFIED BY THE LUBLIN VOIVODESHIP”. Acta Scientiarum Polonorum. Oeconomia 14 (3), 157-66. https://js.wne.sggw.pl/index.php/aspe/article/view/4190.