Mooney, Gavin H., author
Harvester Wheatsheaf, 1994
Buku Teks
Sorkin, Alan L., author
Massachusetts Lexington Books, 1984
Buku Teks
Feldstein, Paul J., author
Delmar, 1999
Buku Teks
Henderson, James W., author
South-Western, 2002
Buku Teks
Wonderling, David, author
Open University Press, 2005
Buku Teks