Tham khảo Thập_tự_chinh_phương_Bắc

  1. ↑ Christiansen, Erik (1997). The Northern Crusades. London: Penguin Books. tr. 287. ISBN 0-14-026653-4.
  2. ↑ Hunyadi, Zsolt; József Laszlovszky (2001). The Crusades and the Military Orders: Expanding the Frontiers of Medieval Latin Christianity. Budapest: Central European University Press. tr. 606. ISBN 963-9241-42-3.
  3. ↑ Christiansen, Eric. The Northern Crusades. London: Penguin Books. pg. 71