Francois, William E.
Grid Inc., 1977
Buku Teks
[compiled by] Warren K. Agee, Phillip H. Ault, Edwin Emery
Harper & Row Publishers, 1986
Buku Teks
Zuckman, Harvey L., author
West Publishing, 1983
Buku Teks
Sandman, Peter M., author
Prentice-Hall, 1976
Buku Teks
McQuail, Denis, author
Collier Macmillan , 1969
Buku Teks