Pro Perl Programming: From Professional to Advanced

Beginning Perl Programming: From Novice to Professional

CompTIA Linux+/LPIC-1 Portable Command Guide: All the commands for the CompTIA LX0-103 & LX0-104 and LPI 101-400 & 102-400 exams in one compact, portable resource

CompTIA Linux+ Portable Command Guide: All the commands for the CompTIA XK0-004 exam in one compact, portable resource, Edition 2

Linux for Developers: Jumpstart Your Linux Programming Skills

CompTIA Cloud+ CV0-003 Exam Cram

CompTIA Linux+ XK0-005 Exam Cram

LPIC-2 Cert Guide: (201-400 and 202-400 exams)