R in 24 Hours, Sams Teach Yourself
Andy Nicholls & Richard Pugh & Aimee Gott
Advanced Programming in the UNIX Environment
W. Richard Stevens & Stephen A. Rago
C Programming: A Beginner's Course
Noel Kalicharan
PostgreSQL: Up and Running
Regina O. Obe & Leo S. Hsu
Cryptography and Network Security: Principles and Practice (6th ...
William Stallings
The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall
Peter N. M. Hansteen