* chromatic's "Modern Perl" - which has a free CC licenced version (although it would be nice for you to pay some money to support the good work of the author and publisher ;-) http://www.onyxneon.com/books/modern_perl/index.html
* Curtis Poe's "Beginning Perl" http://ofps.oreilly.com/titles/9781118013847/
(Bias warning: Curtis is a mate - but it is a very good book on the topic. Honest ;-)
* chromatic's "Modern Perl" - which has a free CC licenced version (although it would be nice for you to pay some money to support the good work of the author and publisher ;-) http://www.onyxneon.com/books/modern_perl/index.html
* Curtis Poe's "Beginning Perl" http://ofps.oreilly.com/titles/9781118013847/
(Bias warning: Curtis is a mate - but it is a very good book on the topic. Honest ;-)