|The stupid question is the question not asked|
It depends what you are looking for, a desk referrence, a good read or a book to dip into when you have a few minutes to learn something new.
I find it very difficult to pick up a book on Perl and read it from cover to cover. Perl Cookbook by Christiansen and Torkington suits my reading style complete recipes covered in a page or two.
Learning Perl is also easy to consume and an excellent next read given the other books that you say you have.
Perl and CGI for the World Wide Web: Visual QuickStart Guide. Has been very heavily criticised because of dodgy parsing subs, "dangerous" scripts and complete lack of use of modules. If you are aware of this then the book still has useful information in an easily digestible form but just be very careful. I have a well thumbed copy myself and it was very useful in the early days but I cringe at some of the things I did based on this book given what I know now.
The perl manual is excellent. Take a look at man perlcheat. The dos and dont's towards the bottom of that page will explain what is wrong with "Perl and CGI for the World Wide Web: Visual QuickStart Guide".