Driscoll, Marcy P, author
Pearson Allyn and Bacon, 2005
Buku Teks
Carlson, Neil R., author
Allyn and Bacon, [date of publication not identified]
Buku Teks
Carlson, Neil R., author
[publisher not identified], 1997
Buku Teks
Buku Teks
Landy, Frank J., author
The Dorsey Press, 1980
Buku Teks