Selart 2015, p. 130. Selart, Anti (2015). "Chapter 3: Livonia and Rus' in the 1230s and 1240s". Livonia, Rus' and the Baltic Crusades in the Thirteenth Century. Leiden/Boston: BRILL. pp. 127–170. doi:10.1163/9789004284753_005. ISBN978-90-04-28475-3.
Selart 2015, pp. 129–130. Selart, Anti (2015). "Chapter 3: Livonia and Rus' in the 1230s and 1240s". Livonia, Rus' and the Baltic Crusades in the Thirteenth Century. Leiden/Boston: BRILL. pp. 127–170. doi:10.1163/9789004284753_005. ISBN978-90-04-28475-3.
Selart 2015, pp. 130–131. Selart, Anti (2015). "Chapter 3: Livonia and Rus' in the 1230s and 1240s". Livonia, Rus' and the Baltic Crusades in the Thirteenth Century. Leiden/Boston: BRILL. pp. 127–170. doi:10.1163/9789004284753_005. ISBN978-90-04-28475-3.
Selart 2015, p. 131. Selart, Anti (2015). "Chapter 3: Livonia and Rus' in the 1230s and 1240s". Livonia, Rus' and the Baltic Crusades in the Thirteenth Century. Leiden/Boston: BRILL. pp. 127–170. doi:10.1163/9789004284753_005. ISBN978-90-04-28475-3.
Selart 2015, pp. 131–133. Selart, Anti (2015). "Chapter 3: Livonia and Rus' in the 1230s and 1240s". Livonia, Rus' and the Baltic Crusades in the Thirteenth Century. Leiden/Boston: BRILL. pp. 127–170. doi:10.1163/9789004284753_005. ISBN978-90-04-28475-3.
Selart 2015, p. 138. Selart, Anti (2015). "Chapter 3: Livonia and Rus' in the 1230s and 1240s". Livonia, Rus' and the Baltic Crusades in the Thirteenth Century. Leiden/Boston: BRILL. pp. 127–170. doi:10.1163/9789004284753_005. ISBN978-90-04-28475-3.