My three favourite Perl books:

1. Camel (Programming Perl)
2. Shiny Ball (Effective Perl Programming)
3. Staghound (Perl Best Practices)

See also:

• perl.org free online Perl books
• Book Reviews (Perl Monks Book Reviews section)

For a long list of links for getting started with Perl see:

• Re: Online Tutorial To Get Started

Extra Book References Added Later

Some book and other recommendations:

• learn.perl.org basic book list, see especially Learning Perl by merlyn (longer book list)
• Modern Perl (by chromatic - fantastic free intro to Perl for decent programmers who are not familiar with perl)
• perlmaven (by szabgab - lots of good free stuff here)
• Perl Taster (Kindle) (by davorg - not free but very cheap)

• Effective Perl Programming by brian d foy et al
• Minimal Perl by Tim Maher

Old PM Nodes discussing books

• thread where chromatic and xdg compare Perl books
• Best Perl Books of All Time
• If I could only own one Perl book, it would be:
• (Perl) Programming Books like the Camel Book
• Which Book
• Book question
• So what is your Perl book "Trilogy" anyway?

• Books to master Perl, LAMP and web development
• Network Programming with Perl Book Recommendation
• What book would be valuable to someone self-taught?
• New Beginning Perl book due out in August
• Perl Videos and Book (followed by re-asking in Perl Book OOPS)
• Programming Perl
• Please guide me regarding good books/resources on data structures and algorithms
• Seeking guidance on getting better at Perl.
• Perl Recommended Reads
• Need a Book for System Administration with Modern Perl Concepts
• Are these Perl Textbooks Good?
• Moving from scripting to programming

• Perl books
• Is Programming Perl still relevant as a reference book?
• good perl book
• Perl books I'd like to have.
• Unwritten Perl Books: 2007 version
• Recommended Reading
• Good Perl book?
• Should I go back to basics of keep moving on?
• Which is best book to start learning Object Oriented Perl?

• Any other good perl books
• Re: Old Programmer New To Perl
• Re^2: Old Programmer New To Perl
• Beginning Perl (Ovid) Vs Learning Perl?
• latest perl book. (follow up by anonymous author of previous Beginning Perl v Learning Perl question?)
• Re^6: Unicode issues with emc uemcli (by pritesh_ugrankar mentions Beginning Perl by Ovid)

Update: Added more references