Craine, J. Ffynlo, author
Addison-Wesley, 1985
Buku Teks
Holland, R.C., author
Pergamon Press, 1983
Buku Teks
Reiss, Michael, author
University Press, 2000
Buku Teks
Drew, Rodney
Gower, 1987
Buku Teks
Gillis, M. Atrhur
Dow Jones-Irwin, 1985
Buku Teks