I'm getting very confused!!!

There are 2 books called Active Birth, they seem to have the same cover but different authors and different covers and different prices??

But then they show the book New Active Birth with the same cover as the one by Janet Balaskas, but the author is Arthur Balaskas?? One published US and the other UK

It's really doing my head in!!

Mantaray can you describe the cover of the one you read for me?? (If you can remember)