Sorry for what might seem like shameless self-promotion, but I figure, why change now?? Routledge has just published a four-volume reference work in their "Critical Concepts in Philosophy" Series, FREE WILL, which I edited (with a new introduction and also short introductions to each volume). It also has a nifty "chronology", which might be of some interest.
Unfortunately, as this is designed as a reference book for libraries, it is not published in paperback and is exorbitantly expensive. I wish that were otherwise, but perhaps in the future a truncated version can be published in paperback.
I would ask you to consider recommending to your home-institution libraries that they acquire this set of volumes. If libraries do not purchase it, I fear no one will see or have access to it, as it is too expensive even for my mother and father to buy it!
If you would like a brochure describing the volumes, let me know.
Have a great summer!
PS I believe the ISBN number, or some sort of identifying number, is: