An encyclopedia of world history : ancient, medieval, and modern chronologically arranged
compiled and edited by William L. Langer
Houghton Mifflin, 1968
 Buku Referensi
Rickard, J.A.
Ancient, medieval and modern history J.A. Rickard and Albert Hyma
New York, N.Y. Barner & Noble, Inc. 1956,
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Webster, Hutton
History of Civilization: ancient and medieval; Vol. 2
D.C. Heath, 1947
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Mayer, Frederick
A History of Ancient of Medieval Philosophy / Frederick Mayer.
American Book Company, 1950
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Hoffman, Ross J.S.
Medieval history
Littlefield, Adams, 1958
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