GPEN GIAC Certified Penetration Tester All-in-One Exam Guide
Raymond Nutting
Using and Administering Linux: Volume 1
David Both
Reversing
Eldad Eilam
Malware Analyst's Cookbook and DVD
Michael Ligh, Steven Adair, Blake Hartstein, Matthew Richard
Red Hat Enterprise Linux 7: Desktops and Administration
Richard Petersen