Tham khảo Người Slav Tây

  1. ↑ Sergey Skorvid (2015). Yury Osipov (biên tập). Slavic languages. Great Russian Encyclopedia (in 35 vol.) Vol. 30. tr. 396—397—389.
  2. ↑ Bohemia and Poland. Chapter 20.pp 512-513. [in:] Timothy Reuter. The New Cambridge Medieval History: c. 900-c.1024. 2000
  3. ↑ Ilya Gavritukhin, Vladimir Petrukhin (2015). Yury Osipov (biên tập). Slavs. Great Russian Encyclopedia (in 35 vol.) Vol. 30. tr. 388–389.
  4. ↑ Christiansen, Erik (1997). The Northern Crusades. London: Penguin Books. p. 287. ISBN 0-14-026653-4.
  5. ↑ Polabian language
  6. ↑ Die Sorben in Deutschland, M.Schiemann, Stiftung für das sorbische Volk, Görlitz 1997
  7. ↑ Rez. MA: M. Borgolte (Hg.): Polen und Deutschland vor 1000 Jahren - H-Soz-u-Kult / Rezensionen / Bücher
  8. 1 2 3 4 5 6 7 Krzysztof Tomasz Witczak (2013). “Poselstwo ruskie w państwie niemieckim w Rock 839: Kulisy śledztwa w świetle danych Geografa Bawarskiego”. Slavia Orientalis (bằng tiếng Ba Lan và Anh). 62 (1): 25–43.
  9. 1 2 3 4 5 6 Jerzy Strzelczyk. Bohemia and Poland: two examples of successful western Slavonic state-formation. In: Timothy Reuter ed. The New Cambridge Medieval History: c. 900-c. 1024. Cambridge University Press. 1995. p. 514.