Nadelman, Lorraine, author
Lawrence Erlbaum, 2004
Buku Teks
Keenan, Thomas, author
Sage Publications, 2004
Buku Teks
Cobb, Nancy J., author
Mayfield Publishing Company , 2001
Buku Teks
Laybourn, Ann
Edinburgh HMSD , 1994
Buku Teks
New York, 1993
Buku Teks