Good guide on Therianthrophy?

I was wondering if anyone can recommed a good book or a good site about therianthrophy (shape shifting into an animal on the astral plane). I don't mean a book on animal spirits/guides but something that really gives rituals for shape shifting.

The only things I have found deal only with lycanthrophy (changing into a wolf), such as the ritual from Anton LaVey. I can't find anything for other animals though. Can anyone help?

A Rite of the werewolf is a good book written by Michael W.Ford.For other animals I will suggest you to read Vox Sabbatum from the same author.