The Linux Command Line
William E. Shotts, Jr.
Think Like a Programmer
V. Anton Spraul
grep Pocket Reference
John Bambenek
Nmap: Network Exploration and Security Auditing Cookbook
Paulino Calderon
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain