Linux in a Nutshell
Arnold Robbins & Ellen Siever & Stephen Figgins & Robert Love
Unix Power Tools
Shelley Powers
Attacking Network Protocols
James Forshaw
Penetration Testing: A Hands-On Introduction to Hacking
Gorgia Weidman
FIST Ultra Edition (Retail Version)
Claymore
FIST ULTRA EDITION form fillable character sheet v1.1