Actually a good place to start is with the books Paul recommended in his book page 102 he made some suggestions. The actual books will be what is readily available in your local library.
Just go in photoread a few of them trust your gut and take the one that feels most useful to you home for activation.
Books that help with activation would be those from the meditation, zen, intuition and psychic ability categories. Again go the the library (or bookstore) Photoread them and select the ones that resonate to you.
Recommending books could be limiting
however the following books might be helpful.
Mind Mapping by Tony Buzan - for activation
Memory books by Harry Lorayne or Tony Buzan
For developing intuition etc..,
books by Jose Silva and the Silva Method
Intuition by Laura Day and Marcia Emery
Psychic Development for Beginners by William W Hewitt is a good one to consider because it has some exercises for developing the senses to pay attention to body mind signals that correlate well with activation.
As already mentioned the best why to find the books that are useful to you Photoread them and see which one pulls you. Yes it might just be the colorful cover, however after previewing, photoreading postviewing a book in a book shop or library you do tend to know whether the book will help you.
Alex