How Linux Works, 3rd Edition
Brian Ward
Building Secure and Reliable Systems
Heather Adkins & Betsy Beyer & Paul Blankinship & Piotr Lewandowski & Ana Oprea & Adam Stubblefield
Mastering OpenLDAP
Matt Butcher
Certified Ethical Hacker (CEH) Exam Cram
William Chuck Easttom
The Cybersecurity Self-Help Guide
ARUN. SONI