1. Official Internet protocols;Postel,1987
2. 50 Ways to Attack Your World Wide Web Systems;Cohen,1995
3. Firewalls and Internet Security;Cheswick,1994
4. Uniform Resource Locators (URL);Berners-Lee,1994
5. Universal Resource Identifiers in WWW: A Unifying Syntax for the Expression of Names and Addresses of Objects on the Network as used in the World-Wide Web;Berners-Lee,1994