Jovanović, Sonja, Vesna Janković-Milić, and Marija Petrović-Ranđelović. “A Homogeneity of European Union and Western Balkan Countries According to Travel and Tourism Sustainability ”. Problemy Ekorozwoju 19, no. 1 (January 8, 2024): 275–284. Accessed July 22, 2024. https://ph.pollub.pl/index.php/preko/article/view/5371.