bgp design

Does anyone know of any good books that specifically deal with BGP design !? I have a large OSPF network and plan to implement 4 internet access points at different parts of the network. I want to control traffic from certain areas to specific internet access points, but have redundancy to other internet access points in case the primary route is down. I was looking at implementing either route maps with attributes to prefer a certain path over the other or break my AS into Confederations. Is this a solid design plan or is there a better way of doing this ?