The Encyclopedia Americana : volume 4
Americana Corporation, 1964
 Buku Referensi
Encyclopaedia Britannica : volume 4
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia Britannica : volume 4
Encyclopaedia Britannica Inc., 1968
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Collier's encyclopedia : volume 4
Macmillan Educational Company, 1990
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Encyclopaedia universalis : volume 4
Encyclopaedia Universalis France S.A. , 1989
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