Nasr, Raja T.
Longman, 1975
Buku Teks
Morgan Kaufmman, 1987
Buku Teks
Edited by Michele A. Paludi
Prentice-Hall, 2002
Buku Teks
Warren G. Bennis; Edgar H. Schei; and David E. Berlew
The Dorsey Press, 1964
Buku Teks
Dubin, Robert, author
Prentice-Hall, 1959
Buku Teks