Allen, James, author
The Benjamin Cumming Pub. Co., 1987
Buku Teks
Weinberg, Gerald, author
John Wiley & Sons, 1973
Buku Teks
Ashley, Ruth, author
John Wiley & Sons, 1978
Buku Teks
Oualline, Steve.
O'Reilly & Associates, 1991
Buku Referensi
Reynolds, John C., author
Prentice-Hall, 1978
Buku Teks