Cracolice, Mark S., author
Thomson, Brooks/Cole, 2007
Buku Teks
Clarke, D.A., author
DP Pub., 1994
Buku Teks
Udvari-Solner, Alice, author
Corwin Press, 2008
Buku Teks
Rosenzweig, Mark R.
Sinauer Associates, 2004
Multimedia
Schwartz, Barry, author
W.W. Norton, 2001
Buku Teks