Habel, Angelika, and Sławomir Mroczkowski. “Cele I Zadania ogrodów Zoologicznych = The Objectives and Tasks of Zoos”. Journal of Education, Health and Sport 5, no. 8 (August 31, 2015): 521–528. Accessed January 24, 2025. https://apcz.umk.pl/JEHS/article/view/3019.