The "Perl Pocket Reference" is the only paper Perl documentation I use. However I always have a browser tab pointing at the "ActivePerl User Guide". Not only does it have all the perldocs, but the documentation for all the modules I have installed too.

Dunedin, New Zealand is not the best place to be to buy technical books so I don't have a copy of PBP, although the compulsion to buy it is increasing!