Kottke, Frederic J.
W.B. Saunders Company, 1990
Buku Referensi
Wong, Donna L., 1948-
Mosby , 1986
Buku Teks
editor-in-chief, Thomas J. Boll ; volume editors, Suzanne Bennett Johnson, Nathan W. Perry, Jr., and Ronald H. Rozensky
American Psychological, 2004
Buku Teks
edited by Patti Rager Zuzelo
Jones and Bartlett Publishers, 2010
Buku Teks
Graham D. Burrows, Robb O. Stanley, Peter B. Bloom
John Wiley & Sons, 2001
Buku Teks