Practical Social Engineering
Joe Gray
Linux iptables Pocket Reference
Gregor N. Purdy
Effective DevOps
Jennifer Davis & Ryn Daniels
Learn C++ Quickly
Unknown
Offensive Shellcode from Scratch
Rishalin Pillay
Mastering Linux Network Administration
Jay LaCroix
Mastering Linux Administration
Alexandru Calcatinge & Julian Balog
The Complete Metasploit Guide
Sagar Rahalkar
Burp Suite Cookbook
Sunny Wear