Building a PCI DSS Information Security Program (PCI Resources ...
Yves B. Desharnais & Francois Desharnais
Advanced Programming in the UNIX Environment
W. Richard Stevens & Stephen A. Rago
Managing Windows Servers With Chef
John Ewart
Gchq
Richard Aldrich
Hacking VoIP: Protocols, Attacks, and Countermeasures
Himanshu Dwivedi