The Encyclopedia Americana : volume 4
Grolier, 1994
 Buku Referensi
The Americana annual : 1998
Grolier, 1998
 Buku Referensi
The Encyclopedia Americana : volume 1
Grolier, 1994
 Buku Referensi
The Americana annual : 1993
Grolier, 1993
 Buku Referensi
The Americana annual : 1996
Grolier, 1996
 Buku Referensi