The wiring on the inside was all done with supplies you can find at Radioshack. The circuits on both sides were run in series, two batteries and two light sockets. Both circuits were run through the same switch which I then set on the outside of the spine. It was hidden when the book was in the actor's hands and easy for her to switch.
Be careful that you get a wattage of bulb that your batteries can support. I spent a long time looking for a short in my circuit before discovering that the bulbs were just too high a wattage and were draining the batteries.