Red Hat and Linux Certification
Mcgraw-Hill Mike Meyers' Linux+ Certification Passport
Become CompTIA Linux+ certified / 400 Pages / Publisher: McGraw-Hill Osborne Media (March 15, 2008) / By Michael Jang / Hardcover
Mcgraw-Hill Ubuntu Certified Professional Study Guide Exam LPI 199
Complete coverage of all the exam objectives / 752 Pages / Publisher: McGraw-Hill Osborne Media; 1 edition (August 5, 2008) / By Michael Jang / Paperback