Essential System Administration
Æleen Frisch
Wireshark for Security Professionals
Jessey Bullock & Jeff T. Parker
Red Hat Enterprise Linux 6 Administration
Sander van Vugt
Professional Linux Kernel Architecture
Wolfgang Mauerer
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain