The Columbia encyclopedia
Columbia University Press, 1950
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The encyclopedia Americana
Americana corporation, 1938
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The encyclopedia American
Americana Corporation, 1980
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Encyclopaedia universalis : volume 28
Encyclopaedia Universalis France S.A. , 1989
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The New Encyclopaedia Britannica : volume 28
Encyclopaedia Britannica Inc., 2003
Buku Referensi
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