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
The New Encyclopaedia Britannica : volume 18, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New Encyclopaedia Britannica : volume 17, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New encyclopaedia Britannica : volume 20, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
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