Perl 5 Internals
by Simon Cozens
Publisher: NetThink 2001
This is a three-hour course which provides a hands-on introduction to how the perl interpreter works internally, how to go about testing and fixing bugs in the interpreter, and what the internals are likely to look like in the future of Perl, Perl 6.
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This books describes and explains Perl (Practical Extraction and Report Language), a scripting language that is usually interpreted and is noted for its extensive use of regular expressions and a large module archive CPAN.
by Greg London - Lulu.com
This document is for people who either want to learn perl or are already programming in perl and just don't have the patience to scrounge for information. This is also a handy desk reference for some of the more common perl related questions.
by Simon Cozens, Peter Wainwright - Wrox Press
The book on Perl installation, the language elements - references, regular expressions, modules, and basic applied techniques. It teachese how to write CGI scripts to generate web pages, hot to access databases in Perl, and beyond.
by Andrew Shitov - DeepText
This book covers many basic and in-depth topics of Perl and provides the initial knowledge you need to start working with Perl 6. The book does not require previous experience with Perl, although some general understanding of programming is assumed.