Salisbury, Harrison E.
Russia
Atheneum, 1965
 Buku Teks SO
Yeltsin, Boris Nikolayevich
The struggle for Russia
Time Books , 1994
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Skrine, Francis Henry, 1847-1933
The expansion of Russia
Cambridge University Press, 2013
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Vernadsky, George
The origins of Russia
At The Clarendon Press, 1959
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Halasz, Nicholas
In the Shadow of Russia
Ronald Press, 1959
 Buku Teks SO