[b] R. N. Bestuzhev-Riumin, Russian History.
[c] D. M. Wallace, Russia.
[d] R. Bell, A History of Russia.
[e] S. M. Soloviov, History of Russia from the Earliest Times.
[f] N. Turgeniev, La Russie et les Russes.
[g] W. K. Kelly, History of Russia.
[h] N. I. Kostomarov, Russian History.
[i] A. Brückner, Geschichte Russlands.
Chapter IV. From Ivan the Great to Ivan the Terrible (1462-1584 A.D.)
[b] R. N. Bestuzhev-Riumin, Russian History.