A Complete Guide to Burp Suite
Sagar Rahalkar
Hacking - The art of exploitation
Jon Erickson
Asterisk: The Definitive Guide
Jim Van Meggelen & Russell Bryant & Leif Madsen
SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys
Michael W Lucas
Bash Idioms: Write Powerful, Flexible, Readable Shell Scripts
Carl Albing & J P Vossen