BEDNORZ, Herbert. Joseph Ratzinger, Dogma und Verkündigung. Śląskie Studia Historyczno-Teologiczne, [S. l.], v. 8, p. 345–350, 1975. Disponível em: https://journals.us.edu.pl/index.php/ssht/article/view/22403. Acesso em: 5 grudz. 2025.