Brikerhaff, David B
West Publishing, 1988
Buku Teks
Doob, Christopher Bates, author
Holt, Rinehart and Winston, 1984
Buku Teks
Harris, Stephen R.
Addison Wesley Longman, 1996
Buku Teks
Smelser, Neil J., author
Prentice-Hall, 1981
Buku Teks
Schaefer, Richard T, author
New York, 2003
Buku Teks