Vernadsky, George
Mongols and Russia
Yele University Press, 1953
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Vernadsky, George
The origins of Russia
Clarendon, 1959
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Fennell, John
Crisis of medieval Russia 1200-1304
Longman, 1983
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Laserson, Max M.
American impact on Russia : diplomatic ideological 1784-1917
Macmillan, 1950
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Thaden, Edward C.
Russia since 1801 : the making of a new society
John Wiley & Sons, 1971
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