Encyclopaedia Britannica CD 97
Encyclopaedia Britannica, inc, 1997
 Multimedia
Everyman's encyclopaedia : volume one
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi
Everyman's encyclopaedia : volume two
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi
Everyman's encyclopaedia : volume three
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi
Everyman's encyclopaedia : volume four
edited by E. F. Bozman
J. M. Dent & Sons, 1958
 Buku Referensi