The New Encyclopaedia Britannica : volume 8
Encyclopaedia Britannica Inc., 1978
 Buku Referensi
The New Encyclopaedia Britannica : volume 8
Encyclopaedia Britannica Inc., 1983
 Buku Referensi
The New Encyclopaedia Britannica : volume 8
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 8, micropaedia ready reference
Encyclopaedia Britannica Inc., 2002
 Buku Referensi
The New Encyclopaedia Britannica : volume 8, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi