French, Wendell L., author
Harper & Row, 1985.
Buku Teks
Barron, Robert A., author
Allyn and Bacon, 1990
Buku Teks
Greenberg, Jerald, author
Prentice-Hall, 2003
Buku Teks
Bass, Bernard M., author
Allyn and Bacon, 1973
Buku Teks
Dipboye, Robert L., author
Harcourt Brace College, 1994
Buku Teks