Diófási-Kovács, Orsolya, and László Valkó. “Furthering Sustainable Development: The Implementation of Green Procurement in Central and Eastern Europe Methods and Experiences from Hungarian Public and Private Organizations”. Problemy Ekorozwoju 10, no. 2 (July 1, 2015): 115–126. Accessed December 4, 2024. https://ph.pollub.pl/index.php/preko/article/view/4915.