Practical Social Engineering
Joe Gray
Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert
Certified Ethical Hacker (CEH) Exam Cram
William Chuck Easttom
Practical Linux Forensics
Bruce Nikkel
Cross-Site Scripting Attacks: Classification, Attack, and Countermeasures
B. B. Gupta and Pooja Chaudhary