Henrickson, Charles, author
McGraw Hil , 2011
Buku Teks
Bettelheim, Frederick A., author
Harcourt Brace Jovanovich College, 1991
Buku Teks
Seager, Spencer L., author
St. Paul West Publishing, 1994
Buku Teks
Seager, Spencer L., author
Brooks/Cole, 2008
Buku Teks
Frederick A. Bettelheim
Thomson, Brooks/Cole, 2007
Buku Teks