Lotan, Shlomo. “Empowering and Struggling in an Era of Uncertainty and Crisis – The Teutonic Military Order in the Latin East, 1250–1291”. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders 16 (July 1, 2011): 19–28. Accessed November 29, 2021. https://apcz.umk.pl/OM/article/view/OM.2011.002.