Berner, R. Thomas, author
Allyn and Bacon, 1992
Buku Teks
Brooks, Brian S., author
Bedford/St. Martins,, 2002
Buku Teks
by Brian S. Brooks [and others]
Martins Press, 1992
Buku Teks
Itule, Bruce D., author
McGraw-Hill, 1994
Buku Teks
Kansas City : University of Missouri
Majalah, Jurnal, Buletin