Breaking off of Thomas' request for books concerning an unbiased (as much as possible anyhow) overview of different theologies, Kevin's suggestion peaked my interest. Kevin suggested the "Views" books such as "The Lord's Supper: Five Views".
I would really like to find a book comparing the justifications/scriptural support for Closed, Close and Open Communion. Looking at The Lord's Supper: Five Views' sample pages I could not tell if this book achieves what I am looking for simply because I am not familiar with the practices of all of the different different denominations mentioned. Would this be a good book for my questions or is there something else that you know of that would be better? Thanks.