Raymond A. Levy, editor
[, Springer], 2012
eBooks
Brent D. Slife, Richard N. Williams, and Sally H. Barlow
Sage, 2001
Buku Teks
Rutan, J. Scott
The Guilford Press, 2007
Buku Teks
Jacobs, Michael
Open University Press, 2006
Buku Teks
Johnson, James H.
Allyn and Bacon, 1997
Buku Teks