Kalvelage, Carl, author
Foresman, 1976
Buku Teks
Baglione, Lisa A., author
Thomson Wadsworth, 2007
Buku Teks
Johnson, Janet Buttolph, 1950-, author
CQ Press, 2012
Buku Teks
Evera, Stephen van, author
Cornell University Press, 1997
Buku Teks
Le Roy, Michael K., author
Wadsworth and Cengage Learning, 2013
Buku Teks