Gwartney, James D., author
Harcourt Brace Jovanovich, 1990
Buku Teks
Becker, William E., author
Prentice-Hall, 1971
Buku Teks
Dunphy, Dexter C., author
McGraw-Hill, 1985
Buku Teks
Callahan, Daniel, author
Collier-Macmillan, 1970
Buku Teks
Mueller, Dennis C., author
Cambridge University Press, 2005
Buku Teks