Howell, David C., author
Thomson Higher Education, 2004
Buku Teks
Howell, David C., author
Thomson/Wadsworth, 2008
Buku Teks
Howell, David C., author
Cengage Learning, 2017
Buku Teks
Hinkle, Dennis E., author
Houghton Mifflin, 2003
Buku Teks
Gravetter, Frederick J., author
Wadsworth and Cengage Learning, 2009
Buku Teks