Red Hat Enterprise Linux 6 Administration
Sander van Vugt
Using and Administering Linux: Volume 1
David Both
Professional Linux Kernel Architecture
Wolfgang Mauerer
grep Pocket Reference
John Bambenek
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain