Foy - Mastering Perl (O'Reilly, 2007)

Frenz - Pro Perl Parsing (Apress, 2005)

Jenness - Extending and Embedding Perl (Manning, 2003)

Orwant - Mastering Algorithms with Perl (O'Reilly, 1999)

Schwartz - Learning Perl 5e (O'Reilly, 2008)

Suehring - Beginning Perl Web Development - From Novice To Pro [CGI,modperl] (Apress, 2006)