The Encyclopedia Americana : volume 8
Grolier, 1994
 Buku Referensi
The Encyclopedia Americana : volume 8
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 8
Americana Corporation, 1964
 Buku Referensi
Collier's encyclopedia; Volume 8
Macmillan, 1990
 Buku Referensi
Grolier family encyclopedia : volume 8
Grolier Incorporated, 1995
 Buku Referensi