Maraini, Fosco
Kodansha AInternational, 1983
Buku Teks
Cobb, Nancy J., author
Mayfield Publishing, 2000
Buku Teks
Casper, Lynne M., author
Sage, 2000
Buku Teks
Cobb, Nancy J., author
Mayfield , 2001
Buku Teks
Fairbanks, Daniel J., author
Brooks, 1999
Buku Teks