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 Jonathan S. Duff, et al.
This book is primarily for people who want to learn Perl 6. It teaches the basics from a Perl 6 perspective, touching on variable interpolation, datastructure use, object construction, threads, closures, symbol tables, and other core features.
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 Robert Nagler - O'Reilly Media
The book takes a fresh look at software development. Business people will learn how XP enables customer-programmer communication for efficient and flexible requirements gathering. Programmers will see how XP allows them to take pride in their craft.