The Columbia encyclopedia
Columbia University Press, 1950
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The encyclopedia Americana
Americana corporation, 1938
Buku Referensi
The encyclopedia American
Americana Corporation, 1980
Buku Referensi
The New Encyclopaedia Britannica : volume 23
Encyclopaedia Britannica Inc., 2003
Buku Referensi
The New Encyclopaedia Britannica : volume 23
Encyclopaedia Britannica Inc., 1988
Buku Referensi
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