Clark, K.L., author
Prentice-Hall, 1984
Buku Teks
Diah Kusumawati, author
Universitas Indonesia, 1988
UI - Skripsi (Membership)
Andrey Andoko, author
Elex Media Komputindo, 1989
Buku Teks
Dobry, T.P., 1953, author
Kluwer, 1990
Buku Teks
Bratko, Ivan, author
Addison-Wesley, 1986
Buku Teks