KOŻUCHOWSKI, Józef. Human ethical obligations towards the animal world. A vision of Robert Spaemann. Studia Ecologiae et Bioethicae, [S. l.], v. 9, n. 1, p. 29–47, 2011. DOI: 10.21697/seb.2011.9.1.02. Disponível em: https://czasopisma.uksw.edu.pl/index.php/seb/article/view/3084. Acesso em: 6 dec. 2025.