The New Encyclopaedia Britannica : volume 9
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 10
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 12
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 13
Encyclopaedia Britannica Inc., 1988
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The New Encyclopaedia Britannica : volume 14
Encyclopaedia Britannica Inc., 1988
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