LUTTRELL, Anthony. The Hospitaller Background of the Teutonic Order. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders. Online. 9 November 2021. Vol. 26, pp. 351-375. [Accessed 9 March 2025]. DOI 10.12775/OM.2021.014.