There's a bunch of books linked to on 
this post, and I'm also going to get the 
Pink Kit as there's a specific module on VBACs.  (See 
this YouTube video if you haven't heard of the Pink Kit.)
I know this wasn't part of your question, but I'm also considering 
calmbirth classes, as I tried hypnobirthing last time but found it a bit too airy fairy for me, and have had calmbirth recommended as giving the same practical benefits without being quite so 'new age' (may have just been the practitioner I had that made me feel that way though).