Rogers, Donald W., author
Human Press, 1983
Buku Teks
Gardiner, William P.
Prentice-Hall, 1997
Buku Teks
Dover Publications , 1971
Buku Teks
Fakultas Ilmu Komputer Universitas Indonesia, 1997
UI - Skripsi (Membership)
Arnold, Robert R., author
John Wiley & Sons, 1978
Buku Teks