USOWICZ, Aleksander. Sapientia Christiana. Śląskie Studia Historyczno-Teologiczne, [S. l.], v. 2, p. 9–18, 1969. Disponível em: https://journals.us.edu.pl/index.php/ssht/article/view/22789. Acesso em: 5 grudz. 2025.