Encyclopaedia universalis : volume 7
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 1983
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 1978
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 1983
 Buku Referensi