Essential System Administration
Æleen Frisch
The Hacker Playbook
Peter Kim
CompTIA Linux+ Guide to Linux Certification
Jason Eckert
Beginning Modern Unix
Manish Jain
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain