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 Bill Hails
This book presents an informal and friendly introduction to some of the core ideas in modern computer science, using the programming language Perl as its vehicle. The book takes the form of a series of working interpreters for the language PScheme.
by Mark Jason Dominus - Morgan Kaufmann
Perl incorporates many advanced features that are not well understood and are rarely used by most Perl programmers, but they are very powerful. One of these techniques is writing functions that manufacture or modify other functions.
by Chan Bernard Ki Hong
This is a free Perl tutorial that is packed with everything you need to know to get started on Perl programming. Throughout the text there are many examples examples, illustrations and exercises in the form of concept consolidation questions.
Perl 6 is the sixth edition of the Perl programming language, representing a major backwards-incompatible rewrite of the language. This online book is going to introduce the reader to the Perl 6 language and its many features.