Sarnowsky, Jürgen. “Axel Ehlers, Die Ablasspraxis Des Deutschen Ordens Im Mittelalter”. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders 16 (July 1, 2011): 327. Accessed April 16, 2024. https://apcz.umk.pl/OM/article/view/NO_DOI_2011_03.