Tham khảo Boris Godunov (Sa hoàng)

  1. ↑ "Godunov".
  2. 1 2 Bain, Robert (1911). "Boris Fedorovich Godunov". In Chisholm, Hugh. Encyclopædia Britannica. 4 (11th ed.). Cambridge University Press. p. 254.
  3. ↑ Troyat, Henri (1993). Ivan le terrible. Flammarion. p. 284. ISBN 2-08-064473-4.
  4. ↑ Haywood, Anthony, Siberia: A Cultural History, Signal Books Ltd, 2010, 288 p., ISBN 978-1904955689, p. 80.

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