KRÓLIKOWSKI, J. Benedykt XV, Encyklika "Principi Apostolorum". Vox Patrum, [S. l.], v. 89, p. 7–20, 2024. DOI: 10.31743/vp.16933. Disponível em: https://czasopisma.kul.pl/index.php/vp/article/view/16933. Acesso em: 12 may. 2024.