Jones, Oliver, author
Prentice-Hall, 1989
Buku Teks
Quercia, Valerie
O`Reilly and Associates, 1993
Buku Referensi
Brown, J. Robert, author
Que, 2000
Buku Teks
Bowles, Kenneth, author
Byte Books, 1980
Buku Teks
Ignizio, James P., author
Prentice-Hall, 1991
Buku Teks