French, Sally, author
Butterworth-Heinemann, 2001
Buku Referensi
Tinkler, Penny, author
Open University Press, 2004
Buku Teks
Chaika, Elaine, author
Whurr Publishers, 2000
Buku Teks
Marvin R. Goldfried, editor
American Psychological Association, 2001
Buku Teks
Bien, Thomas, author
Wisdom Publications, 2006
Buku Teks