Krajniak, R. “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, vol. 19, July 2015, pp. 260-2, doi:10.12775/OM.2014.015.