Dess, Gregory G., author
McGraw-Hill/Irwin, 2005
Buku Teks
Anderson, Thomas J., author
South- Western , 1958
Buku Teks
Robinson, E. A. G., author
At the University Press , 1946
Buku Teks
Porter, Michael E., author
The Free Press, 1985
Buku Teks
Czepiel, John A.
Prentice-Hall, 1992
Buku Teks