Python Playground
Geeky Projects for the Curious Programmer
The Hacker Playbook
Peter Kim
Linux® Essentials
Richard Blum
Mastering Linux Security and Hardening
Donald Tevault
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain