Pressman, Roger S.
Dorset House, 1991
Buku Teks
Gultom, Edwin Bart
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2003
UI - Tesis Membership
Gorsline, G. W.
Prentice-Hall, 1980
Buku Teks SO
Shiller, Larry
Yourdon Press, 1990
Buku Teks SO
Lewis, T.G. [Theodore Gyle]
Reston Publishing, 1982
Buku Teks SO