The New Encyclopaedia Britannica : volume 14
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 14, micropaedia konowledge in depth
Encyclopaedia Britannica Inc., 2002
 Buku Referensi
The New Encyclopaedia Britannica : volume 14, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
Everyman's encyclopaedia : volume one
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi
Everyman's encyclopaedia : volume two
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi
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