Linux Commands Cheat Sheet
Bob Reselman and Burr Sutter
Introducing Python
Bill Lubanovic
Dolores Claiborne
Stephen King
(ISC)2 CCSP Certified Cloud Security Professional Official Practice ...
Mike Chapple & David Seidl
Mastering Linux - Fundamentals
Paul Cobbaut
Mastering Linux - Servers
Mastering Linux - System Administration
Mastering Linux - Networking