Winnicki, Tomasz. “About the State Environmental Council of Poland (PROS) and the Future of ‘Problemy Ekorozwoju Problems of Sustainable Development’”. Problemy Ekorozwoju / Problems of Sustainable Development 4, no. 1 (January 5, 2009): 11–13. Accessed December 15, 2025. https://ph.pollub.pl/index.php/preko/article/view/4707.