The New Encyclopaedia Britannica : volume 17
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 17
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 17, micropaedia konowledge in depth
Encyclopaedia Britannica Inc., 2002
 Buku Referensi
The New Encyclopaedia Britannica : volume 17, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
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Encyclopaedia universalis : volume 17
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi