Chadwick, H. Munro
Cambridge University Press, 1926
Buku Teks
Croiset, Maurice
F. S. Crofts, 1951
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Ewing, Ethel E.
Rand McNally & Company, 1962
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Toynbee, Arnold J.
Meridian Books, 1958
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Blois, Lukas de
Routledge, 1997
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