Sommers-Flanagan, John, author
John Wiley & Sons, 2012
Buku Teks
Cottone, R. Rocco, author
Allyn & Bacon, 1992
Buku Teks
Sharf, Richard S., author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Gehart, Diane R, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Ivey, Allen E., author
Allyn and Bacon, 1996
Buku Teks