Linux Server Security
Chris Binnie
Kali Linux - An Ethical Hacker's Cookbook
Himanshu Sharma
Linux Bible
Christopher Negus
Essential System Administration
Æleen Frisch
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain