The Encyclopedia Americana : volume 18
Grolier, 1994
Buku Referensi
The Encyclopedia Americana : volume 18
Americana Corporation, 1977
Buku Referensi
Collier's encyclopedia; Volume 18
Macmillan, 1990
Buku Referensi
Grolier family encyclopedia : volume 18
Grolier Incorporated, 1995
Buku Referensi
The World book encyclopedia : volume 18
World Book, 1984
Buku Referensi