1.
KRAJNIAK, Radosław. Maciej Dorna, Die Brüder des Deutschen Ordens in Preußen 1228–1309. Eine. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders. Online. 13 July 2015. Vol. 19, pp. 260-262. [Accessed 2 May 2026]. DOI 10.12775/OM.2014.015.