Laskey, Marcia L., author
Allyn and Bacon, 1997
Buku Teks
Meyers, Chet, author
Jossey-Bass Publishers , 1993
Buku Teks
edited by Russell M. Cooper
University of Minnesotta Press , 1958
Buku Teks
Hogan, Christine, author
Eruditions Publishing, 1999
Buku Teks
Barkley, Elizabeth F., author
Jossey-Bass, 2005
Buku Teks