McClam, Tricia, author
Thomson Brooks/Cole, 2005
Buku Teks
Kember. N.F., author
Edward Arnold, 1984
Buku Teks
Duran, Randall E.
Cengage Learning, 2013
Buku Teks
Neukrug, Ed, author
Thomson Learning, Inc., 2004
Buku Teks
Neukrug, Edward S., author
Cengage Learning, 2017
Buku Teks