Rutan, J. Scott, author
The Guilford Press, 2007
Buku Teks
edited by Samuel Sipp
McGraw-Hill , 1982
Buku Teks
Levine, Baruch
Prentince Hall, 1979
Buku Teks
edited by Gary R. Vandenbos
Sage, 1980
Buku Teks
Ivey, Allen E., author
Allyn and Bacon, 1996
Buku Teks