Kime, Robert E.
Prentice-Hall, 1977
Buku Teks
Read, Donald A., author
Janes and Bartlett Publihers, 1997
Buku Teks
Bartholomew, L. Kay
Jossey-Bass, 2011
Buku Teks
Russell, Robert D.
National Education Association, 1975
Buku Teks
Greene, Walter H., author
Waveland Press, 1984
Buku Teks