Bennis, Warren G., author
Harper and Row, 1968
Buku Teks
Edward, Richard C., author
Prentice-Hall, 1972
Buku Teks
Lens, Sidney
Thomas Y Corwell , 1969
Buku Teks
Sullivan, Thomas J., 1944-, author
Macmillan, 1988
Buku Teks
Boyd, Maurice
Allyn and Bacon, Inc., 1969
Buku Teks