The Linux Command Line
William E. Shotts, Jr.
Python Playground
Geeky Projects for the Curious Programmer
Python for Informatics
Charles Severance
The Hacker Playbook 2: Practical Guide To Penetration Testing
Peter Kim
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain