The books below are sold through Amazon.com, They are the same books that I have in my library and I
recommend them highly.
Hacking Exposed 4th Edition$34.99
Hack Proofing Your Network$34.97
Hacking Linux Exposed 2nd edition $39.99
Practical Intrusion Detection$49.99
Network Intrusion DetectionAn Analyst's Handbook$31.50
Building Internet Firewalls2nd Edition$34.97