Nelson-Jones, Richard, author
Harcourt, Brace & World, 1996
Buku Teks
Nelson-Jones, Richard, author
Brooks/Cole , 1990
Buku Teks
Warren G. Bennis; Edgar H. Schei; and David E. Berlew
The Dorsey Press, 1964
Buku Teks
Seleebey, Dennis, author
Columbia University Press, 2001
Buku Teks
Basic Books, 1956
Buku Teks