ZIRKER, Hans. Vorwort. Religionspädagogische Beiträge, [S. l.], v. 2, p. 1–2, 1978. DOI: 10.20377/rpb-342. Disponível em: https://rpb-journal.de/index.php/rpb/article/view/342. Acesso em: 29 juli. 2026.