Advanced Perl Programming is a 1997 book by Sriram Srinivasan which covers complex techniques needed in production level Perl. The second edition, by Simon Cozens and edited by Allison Randal, was published in 2005. It contains a different set of high-level programming techniques intended for practical use, and is described at www.oreilly.com. Related books include Programming Perl, Perl Cookbook, and Perl Hacks.