JOHN, H. Wappenbuch des Landkreises Breisgau-Hochschwarzwald. Archivnachrichten, [S. l.], n. 9, p. 4, 1994. DOI: 10.53458/an.vi9.4681. Disponível em: https://journals.wlb-stuttgart.de/index.php/an/article/view/4681. Acesso em: 22 juni. 2025.