Clark, Alan, author
Hodder and Stoughton, 1993
Buku Teks
Wimmert, Robert J., author
Holt, Rinehart and Winston, 1969
Buku Teks
Breckner, David, author
Prentice-Hall, 1970
Buku Teks
Ward, Brice, author
Blue Ridge Summit TAB Books , 1971
Buku Teks
Shneiderman, Ben, author
Massachusetts Winthrop Publishers, 1980
Buku Teks