This is a tiny book, little bigger than a diary and only a hundred pages long. It's exactly what the title says - a reference to the Tk parts of the Perl::Tk module. It's a quick guide to widgets, callbacks, events etc. in the Perl Tk module, with a one- line description of each. It's intended as a companion to the 'Learning Perl/Tk' book. Personally I think the 'Learning' book is well laid out and well referenced, so I don't quite see the need for both. However, if you need a handy reference to take on the road and don't want to lug your whole bookcase in your boot, then this could be a very handy little book.
Book cover image courtesy of Open Library.