The New Encyclopaedia Britannica : volume 21
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 22
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 23
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 24
Encyclopaedia Britannica Inc., 2003
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The New Encyclopaedia Britannica : volume 25
Encyclopaedia Britannica Inc., 2003
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