RTFM - Red Team Field Manual
Ben Clark
Technical Writing for Business People
Carrie Marshall
Mastering Linux Security and Hardening
Donald Tevault
Mastering Kali Linux for Advanced Penetration Testing
Vijay Kumar Velu
CCNA 200-301 Official Cert Guide, Volume 2
Wendell Odom
CCNA 200-301 Official Cert Guide Library
Wendell Odom & Jason Gooley & David Hucaby