The New Encyclopaedia Britannica : volume 29, micropaedia konowledge in depth
Encyclopaedia Britannica Inc., 2002
 Buku Referensi
The New Encyclopaedia Britannica : propaedia outline of knowledge
Encyclopaedia Britannica Inc., 2002
 Buku Referensi
The New encyclopaedia Britannica : propaedia outline of knowledge
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
Encyclopaedia Britannica : volume 23
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia Britannica : volume 23
Encyclopaedia Britannica Inc., 1968
 Buku Referensi
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