Puppet Best Practices
Chris Barbour & Jo Rhett
Instant PHP Web Scraping
Jacob Ward
Attacking Network Protocols
James Forshaw
Python for Kids
Jason R. Briggs
Intermediate Perl: Beyond the Basics of Learning Perl
Randal L. Schwartz & Brian D Foy & Tom Phoenix
Learning Perl
Mastering Perl
Brian D Foy
Perl One-Liners
Peteris Krumins
Programming Perl
Tom Christiansen & Brian D Foy & Larry Wall & Jon Orwant