Brailsford, D.F., author
Ellis Horwood, 1979
Buku Teks
Grisworld, Ralph E.
Prentice-Hall, 1983
Buku Teks
LePage, Wilbur R., author
Prentice-Hall, 1978
Buku Teks
Tucker, Allen B., author
Holt Rinehart and Winston, 1983
Buku Teks
Holt, R.C., author
Reston Publishing, 1980
Buku Teks