DEMEL, Bernhard. The policy of the Livonian branch of the Teutonic Order towards the Holy Roman Empire in the years 1521 to 1561/62. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders. Online. 10 May 2016. Vol. 20, pp. 145-172. [Accessed 14 October 2026]. DOI 10.12775/OM.2015.007.