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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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 chromatic - Onyx Neon Press
Modern Perl is one way to describe how experienced and effective Perl 5 programmers work. They use language idioms. They take advantage of the CPAN. They're recognizably Perlish, and they show good craftsmanship and a full understanding of Perl.
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.
by Allen B. Downey - Green Tea Press
After having completed this book, you should be able to write programs to solve relatively difficult problems in Perl 6, but my main aim is to teach computer science, software programming, and problem solving rather than solely to teach the Perl 6.