Mastering Linux Security and Hardening
Donald Tevault
Python Playground
Geeky Projects for the Curious Programmer
Practical Cyber Intelligence
Wilson Bautista
PTFM
Tim Bryant
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain