Encyclopaedia Britannica : volume 18
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia Britannica : volume 18
Encyclopaedia Britannica Inc., 1968
 Buku Referensi
Encyclopaedia universalis : volume 18
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
 Buku Referensi
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