Books by Robb H. Tracy
CompTIA Linux+ /LPIC-1 Certifi
CompTIA Linux+ /LPIC-1 Certification
CompTIA Network+ certification practice exams (exam N10-005)
LPIC-1/CompTIA Linux+ certification all-in-one exam guide (exams LPIC-1/LX0-101 & LX0-102)
Novell Certified Linux 9 (CLE 9) Study Guide
Novell Certified Linux Engineer (Novell CLE)
Novell Certified Linux Engineer