Popiel, Marcin. “The Importance of Sustainable Tourism in the Socio-Economic Development on the Example of Croatia”. Studies of the Industrial Geography Commission of the Polish Geographical Society 29, no. 3 (February 23, 2015): 67–82. Accessed May 5, 2024. https://prace-kgp.uken.krakow.pl/article/view/2961.