I suppose what I am about to suggest is anathema, but I shall suggest to you a series of books that are not about Perl.
Bruce Eckel writes a series of books (
Thinking in C++ and
Thinking in Java) that do a very good job of explaining what object oriented programming is, what it does, how it works, and the situations in which it is appropriate. Because not everything needs to be an object <cough>java<\cough>. While the information he provides will not tell you the specifics on how to do this in Perl. It will help your overall understanding of OOP and that will make you a better programmer in Perl too.
Moreover, both of these books are available for free in electronic format. Doesn't get much better than that.
Matt
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