The New Encyclopaedia Britannica : volume 1, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New Encyclopaedia Britannica : volume 3, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New Encyclopaedia Britannica : volume 7, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New Encyclopaedia Britannica : volume 5, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi
The New Encyclopaedia Britannica : volume 9, micropaedia ready reference
Encyclopaedia Britannica Inc., 1998
 Buku Referensi