The Encyclopedia Americana : volume 1
Americana Corporation, 1977
Buku Referensi
The Encyclopedia Americana : volume 1
Americana Corporation, 1964
Buku Referensi
Collier's encyclopedia : volume 1
Macmillan Educational Company, 1990
Buku Referensi
Grolier family encyclopedia : volume 1
Grolier Incorporated, 1995
Buku Referensi
The World book encyclopedia : volume 1
World Book, 1985
Buku Referensi