RHCSA/RHCE Red Hat Linux Certification Study Guide, Seventh Edition (Exams EX200 & EX300)
Linux Bible
Linux Pocket Guide: Essential Commands
The Linux Command Line, 2nd Edition: A Complete Introduction
UNIX and Linux System Administration Handbook (5th Edition)
A Practical Guide to Linux Commands, Editors, and Shell Programming (4th Edition)
CEH v10 Certified Ethical Hacker Study Guide
Murach's Python Programming
CCNA Routing and Switching Portable Command Guide (ICND1 100-105, ICND2 200-105, and CCNA 200-125)
Linux Command Line and Shell Scripting Bible, 3rd Edition