Graf, Rudolf F., author
Newnes, 1997
Buku Teks
Golding, E.W., author
Pitman Paperbacks, 1970
Buku Teks
Carr, Joseph J., author
Reston, 1979
Buku Teks
Robertson, Christopher R., author
Edward Arnold, 1993
Buku Teks
Lenk, John D., author
Prentice-Hall, 1981
Buku Referensi