Network Security Assessment: Know Your Network
Chris McNab
Linux Administration: A Beginner's Guide, Fifth Edition
Wale Soyinka
Jenkins Essentials
Mitesh Soni
21st Century C: C Tips From the New School
Ben Klemens
PMP® Exam Practice Test and Study Guide, Ninth Edition
J. Leroy Ward, Pmp, Pgmp & Ginger Levin