Red Hat Enterprise Linux 6 Administration
Sander van Vugt
Mastering Linux Security and Hardening
Donald Tevault
Web Penetration Testing with Kali Linux
Gilberto Najera-Gutierrez & Juned Ahmed Ansari
Linux® BIBLE
Christopher Negus
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain