Ettlin, Walter A., author
McGraw-Hill, 1990
Buku Teks
O`Donnell, Sandra Martin, author
Prentice-Hall, 1994
Buku Teks
Micropro International Corporation, 1977
Buku Teks
Eko Nugroho, author
Andi, 1995
Buku Teks
Macek, Rosanne M.
Meckler Corporation, 1988
Buku Referensi