The World book encyclopedia : volume 8
World Book, 1985
 Buku Referensi
The World book encyclopedia : volume 8, H
Field Enterprises Educational Corporation, 1963
 Buku Referensi
The Cultural library : volume 7, great events in world history
Parents' Magazine's Cultural Institute, 1965
 Buku Referensi
The Encyclopedia Americana : volume 8
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 8
Americana Corporation, 1964
 Buku Referensi