Network Security Bible
Eric Cole & Ronald L. Krutz
How Linux Works, 2nd Edition: What Every Superuser Should Know
Brian Ward
Mastering Hyper-V® 2012 R2 with System Center and Windows Azure™
John Savill
Mastering: System Center 2012 R2 Configuration Manager
Santos Martinez, Peter Daalmans & Brett Bennett
CompTIA Network+ Certification Guide
Glen D. Singh