CompTIA Linux+ Guide to Linux Certification
Jason Eckert
Metasploit Penetration Testing Cookbook
Abhinav Singh
Linux in a Nutshell
Arnold Robbins & Ellen Siever & Stephen Figgins & Robert Love
Serious Python
Julien Danjou
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain