Routledge Taylor & Francis Group,
Majalah, Jurnal, Buletin
DeFleur, Melvin Lawrence, author
Houghton-Miffiln, 1985
Buku Teks
Sereno, Kenneth K., author
Harper & Row, 1970
Buku Teks
Krizan, A. C. (Buddy), author
Thomson, 2008
Buku Teks
Beck, Charles E., author
Prentice-Hall, 1999
Buku Teks