The New Encyclopaedia Britannica : volume 12
Encyclopaedia Britannica Inc., 1978
 Buku Referensi
The New Encyclopaedia Britannica : volume 12
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 12, micropaedia ready reference
Encyclopaedia Britannica Inc., 2002
 Buku Referensi
The New Encyclopaedia Britannica : volume 12, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
Encyclopaedia Britannica : volume 12
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
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