The Camel, the real Bible of Perl.
http://www.amazon.com/dp/0596000278
The Llama, the standard Perl tutorial
http://www.amazon.com/dp/0596101058
Now in its 2nd edition, a problem-oriented book of how to do just about everything.
http://www.amazon.com/dp/0596003137/
By Damian Conway, the best explantion of how to do standard Perl 5 object-oriented programming.
http://www.amazon.com/dp/1884777791/
Damian's follow-up to Object Oriented Perl shows how to write good, maintainable Perl code.
http://www.amazon.com/dp/0596001738/
Published here in Chicago, it's the only magazine devoted to Perl.
Submit a PR to github.com/petdance/perl101
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