Pressley, Michael, author
Guilford Press, 2007
Buku Teks
edited by Carolyn Uhlinger Shantz and Wiliard W. Hartup
Cambridge , 1995
Buku Teks
Bergin, Christi Crosby, author
Wadsworth and Cengage Learning, 2012
Buku Referensi
edited by Ross Vasta
Jessica Kingsley, c1992
Buku Teks
Weis, Robert, author
Sage, 2008
Buku Teks