The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall
Peter N. M. Hansteen
Unix and Linux System Administration Handbook 5th Edition
Evi Nemeth & Garth Snyder & Ben Whaley & Trent Hein
4G: Deployment Strategies and Operational Implications
Trichy Venkataraman Krishnamurthy & Rajaneesh Shetty
Cryptography in C and C++
Michael Welschenbach
Getting Started With MariaDB - Second Edition
Daniel Bartholomew