Mayer, Robert R., author
Prentince-Hall, 1980
Buku Teks
Saeed, Khalid, author
Avebury, 1994
Buku Teks
Melissa Calaresu; Danielle van den Heuvel.
Routledge, 2016
Buku Teks
Henderson, Bruce B., author
A Lisa Drew Book, 1996
Buku Teks
Engwicht, David
New Society Publihers, 1999
Buku Teks