Klooster, Dale H., author
South-Western, 1990
Buku Teks
Craine, J. Ffynlo, author
Addison-Wesley, 1985
Buku Teks
Holland, R.C., author
Pergamon Press, 1983
Buku Teks
Drew, Rodney
Gower, 1987
Buku Teks
Gillis, M. Atrhur
Dow Jones-Irwin, 1985
Buku Teks