DeFleur, Melvin Lawrence, author
Houghton-Miffiln, 1985
Buku Teks
Sereno, Kenneth K., author
Harper & Row, 1970
Buku Teks
Johannesen, Richard L., author
Waveland Press, 1983
Buku Teks
Myers, Gail E., author
McGraw-Hill, 1992
Buku Teks
Cherry, Colin, author
MIT Press, 1968
Buku Teks