^ abIben Fonnesberg-Schmidt, The Popes and the Baltic Crusades: 1147–1254 (Brill, 2007), p. 228.
^Rudolf Hiestand, 'The Military Orders and Papal Crusading Propaganda', in Victor Mallia-Milanes, The Military Orders Volume III: History and Heritage (London: Routledge, 2017), p. 155.
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