Osgood, William R.
Prentice-Hall, 1984
Buku Teks
McClure, Rhyder, author
Brady, 1989
Buku Teks
McClure, Rhyder, author
Brady, 1990
Buku Teks
Buser, Susanne, author
Elex Media Komputindo, 1992
Buku Teks
Hoskin, Robert E., author
Prentice-Hall, 1986
Buku Teks