Zechmeister, Eugene B., author
Thomson/Wadsworth, 2003
Buku Teks
Jaccard, James, author
Wadsworth, 1983
Buku Teks
Fallik, Fred
The Dorsey Press, 1983
Buku Teks
Pagano, Robert R., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Howell, David C., author
Thomson Higher Education, 2004
Buku Teks