Colin, Virginia L
McGraw-Hill , 1996
Buku Teks
Keenan, Thomas, author
Sage Publications, 2004
Buku Teks
Gurian, Michael, author
Serambi Ilmu Semesta, 2006
Buku Teks
Cobb, Nancy J., author
Mayfield Publishing Company , 2001
Buku Teks
Hetherington, Mavis E.
McGraw-Hill , 2006
Multimedia