The best book I have read on vaccination to date is The Vaccine Safety Manual For Concerned Families and Health Practitioners. It contains both pros and cons, as well as over 1000 studies, with over 90 graphs etc, to help you make an informed decision.
It contains comments from registered doctors and paeditricians who are both for and against vaccines.

Personally, I believe this is not a decision you want to take lightly. Good on you for taking the time to do the 'dirty work'!! It sucks that we mummas have to be investigative health researchers too but no matter what you decide, you'll be so grateful that you made the effort!