Sadowski, Ryszard F. “The Influence of the Concept of Leisure on Sustainable Tourism”. Studia Ecologiae et Bioethicae 16, no. 2 (June 30, 2018): 29–40. Accessed April 5, 2025. https://czasopisma.uksw.edu.pl/index.php/seb/article/view/6474.