Cottone, R. Rocco, author
Allyn & Bacon, 1992
Buku Teks
edited by Robert Dessaix
Oxford University Press, 1993
Buku Teks
Sharf, Richard S., author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Gehart, Diane R, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
editor, Don C. Locke, Jane E. Myers, Edwin L. Herr
Sage, 2001
Buku Referensi