Tham khảo Terra_Mariana

  1. ↑ “Terra Mariana”. The Encyclopedia Americana. Americana Corp. 1967. 
  2. ↑ "Medieval Livonia" – Google Search. 
  3. ↑ Bilmanis, Alfreds (1944). Latvian-Russian Relations: Documents. The Latvian legation. 
  4. ↑ Herbermann, Charles George (1907). The Catholic Encyclopedia. Robert Appleton Company. 
  5. ↑ Bilmanis, Alfreds (1945). The Church in Latvia. Drauga vēsts. 
  6. ↑ Knut, Helle (2003). The Cambridge History of Scandinavia: Prehistory to 1520. Cambridge University Press. tr. 269. ISBN 0-521-47299-7. 
  7. ↑ The Order of the Cross of Terra Mariana. President of the Republic of Estonia, Estonian State Decorations. Truy cập 2011-01-22
  • Brundage, James. Thirteenth-Century Livonian Crusade: Henricus De Lettis and the First Legatine Mission of Bishop William of Modena. Franz Steiner Verlag. pp. 1–9