So I decided after reading quite a few recommendations on BB that I would buy the book called New Active Birth, or so I thought, I've been looking around to get the best price (on a bit of a budget) and there are actually 2 books one is New Active Birth, by Arthur Balaskas,..The other is called Active Birth by Janet Balaskas, now I'm confused as to which one to get

So can anyone let me know which they have, if they are different is one better than the other??