Pressman, Roger S., author
Dorset House, 1991
Buku Teks
Cusumano, Michael A., editor
[, Springer-Verlag], 2012
eBooks
White, Ron, author
Ziff-Davis, 1993
Buku Teks
Gultom, Edwin Bart, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2003
UI - Tesis Membership
Gorsline, G. W., author
Prentice-Hall, 1980
Buku Teks