MAROŃ, Franciszek. J. Sawicki, Concilia Poloniae, t. X. Śląskie Studia Historyczno-Teologiczne, [S. l.], v. 3, p. 344–348, 1970. Disponível em: https://journals.us.edu.pl/index.php/ssht/article/view/22783. Acesso em: 5 grudz. 2025.