MURRAY, Alan V. The Sword Brothers at War: Observations on the Military Activity of the Knighthood of Christ in the Conquest of Livonia and Estonia (1203–1227). Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders. Online. 1 August 2013. Vol. 18, pp. 27-37. [Accessed 4 March 2026]. DOI 10.12775/OM.2013.002.