Books
RHCSA/RHCE Red Hat Linux Certification Study Guide, Seventh Edition (Exams EX200 & EX300)
2016
RHCSA/RHCE Red Hat Linux Certification Practice Exams with Virtual Machines (Exams EX200 & EX300)
2012
Oracle Solaris 11 System Administration The Complete Reference
2012
RHCSA Red Hat Enterprise Linux 9 Certification Study Guide, Eighth Edition (Exam EX200)
2023
Ubuntu Server Administration
2008
Atlas of American Diversity
1998