In context, the Perl section you linked to seems OK, as that chapter is devoted to the shortest-possible synopsis of the various packaged languages. It implicitly refers to cpan with the "how to install modules" line, and refers you to perl(1) and the Camel - pretty fair advice in my book. To attempt anything else would take a whole chapter by itself.
The BASH tutorial link is part of the LDP, which also seems to be avoiding any major language tutorials (the PHP-HOWTO has now been replaced with a link to php.net). I think as there's so much information out there already for anyone who decides they want to learn Perl, adding Yet Another Perl Tutorial is probably a bit superflous. Maybe, as you say, a couple of extra links (perl.org etc.) and adding the Llama to the book list is all that's needed.