“Coverage in Intrusion Detection Systems” by Marcus Ranum: philby.ucsd.edu/~cse291_IDVA/papers/orig_names/Coverage-in-IDS-White-Paper-final.pdf
Intrusion Defense: www.intrusiondefense.net
Network Intrusion Detecion: An Analyst's Handbook (2nd edition) by Stephen Northcutt, Judy Novak and Donald McLachlan. New Riders, 2000.
Prelude Web Site: www.prelude-ids.org
SANS Institute Web Site: www.sans.org/infosecFAQ
Silicon Defense: www.silicondefense.com
Snort Web Site: www.snort.org