ONISZCZUK-JASTRZĄBEK, Aneta; DĘBICKA, Olga; GUTOWSKI, Tomasz. Ecotourism in Poland. Studies and Materials of the Institute of Maritime Transport and Trade, [S. l.], n. 14, p. 310–324, 2017. DOI: 10.26881/sim.2017.4.20. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/studiaimaterialy/article/view/116. Acesso em: 25 aug. 2024.