The Linux Command Line
William E. Shotts, Jr.
Essential System Administration
Æleen Frisch
Unix Power Tools
Shelley Powers, Jerry Peek, Tim O'Reilly & Mike Loukides
Math Adventures with Python
Peter Farrell
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain