Uchmański, Janusz, and Sylwia Niczyporuk. “Manifestations and Causes of Altruism in Animals”. Studia Ecologiae et Bioethicae 19, no. 2 (June 30, 2021): 85–100. Accessed April 26, 2024. https://czasopisma.uksw.edu.pl/index.php/seb/article/view/8786.