The Encyclopedia Americana : volume 22
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 22
Americana Corporation, 1964
 Buku Referensi
Collier's encyclopedia : volume 22
Macmillan Educational Company, 1990
 Buku Referensi
The World book encyclopedia : volume 22
World Book, 1984
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 22
Americana Corporation, 1960
 Buku Referensi