References and Objects

I think Randal writes good books. They might not cover everything (and that's why the Camel Book or the Perl Bible is there), Randal's books are easy to understand.

The new books I found is called Learning Perl Objects, References & Modules By Randal L. Schwartz With Tom Phoenix . If any one wants to learn about references, complex data structures and objects, this is a good book to being with.