Kwiatkowski, Krzysztof. “Radosław Biskup, Das Domkapitel Von Samland (1285–1525)”. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders 16 (July 1, 2011): 325. Accessed April 25, 2024. https://apcz.umk.pl/OM/article/view/NO_DOI_2011_01.