I review thousands of candidates CVs every week. If the books are related specifically to the job you are aiming for, then mention them in your hobbies and interests section. Too many candidates fail to state that they are actually interested in the job sector they are applying for.
For example, I recruit for jewellery and I like to see candidates putting something like jewellery making or reading about jewellery in their interests section. It shows that they have a genuine interest in that subject area. If they are applying for a jewellery design position for African jewellery, then I would be encouraged to see that they have read a few books on this area. Not so much though if they were applying for a Jewellery finance managers position!
I would not list the books in any other section, and don't create too much of a focus on this, as BrianGarvin says, employers want definite experience and results, not possibilities. If you do add them, only put one or two and keep it brief i.e one sentence MAX. Employers DO NOT want to see irrelevant info on candidates CVs. Trust me, that's one of the worst mistakes candidates make!