Cyberspace in Peace and War, Second Edition
Martin C. Libicki
Asterisk: The Definitive Guide
Jim Van Meggelen & Russell Bryant & Leif Madsen
Nmap Network Scanning
Gordon Lyon
Pluggable Authentication Modules
Kenneth Geisshirt
Cross-Site Scripting Attacks: Classification, Attack, and Countermeasures
B. B. Gupta and Pooja Chaudhary