Heiserman, David L., author
Prentice-Hall, 1981
Buku Referensi
Horn, Delton T.
Elex Media komputindo, 1989
Buku Teks
editor, Arthur B. Williams
McGraw-Hill, 1984
Buku Referensi
Charles A. Harper, editor-in-chief
McGraw-Hill, 1974
Buku Referensi
Bochinski, Julianne Blair, author
John Wiley & Sons, 1996
Buku Referensi