Bera, Milena, and Aneta Zaremba. “Selected Elements of the Infrastructure of Polish National Parks from 2005 to 2015”. Studia Ecologiae et Bioethicae 19, no. 2 (June 30, 2021): 77–84. Accessed April 19, 2024. https://czasopisma.uksw.edu.pl/index.php/seb/article/view/8785.