Brennan, James F.
Prentice-Hall, 1991
Buku Teks SO
Wrightsman, Lawrence S.
Brooks/Cole , 1998
Buku Teks
Shneiderman, Ben
Massachusetts Winthrop Publishers, 1980
Buku Teks SO
Brennan, James F.
RajaGrafindo Persada, 2006
Buku Teks SO
Olds, Linda E.
State University of New York Press, 1992
Buku Teks SO