Jedzok, Dariusz. “Vanishing Bars. On the Threshold of the Third Century of Zoological Gardens”. Zoophilologica. Polish Journal of Animal Studies, no. 5 (December 25, 2019): 83–95. Accessed November 15, 2026. https://journals.us.edu.pl/index.php/ZOOPHILOLOGICA/article/view/8037.