The New encyclopaedia Britannica : volume 26, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New encyclopaedia Britannica : volume 29, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New encyclopaedia Britannica : volume 28, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New encyclopaedia Britannica : volume 27, macropaedia knowledge in depth
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New Encyclopaedia Britannica : propaedia
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
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