Books On Mushrooms

[Kazman]

Made a quick search on this, couldn't find what I was looking for. Sorry if there's similar threads already.

What are your best books about mushrooms? I've currently read two of Martin Ball's books and I like them a lot. He has one called mushroom wisdom and I'm interested in that one, but in Being Infinite he mentions that he wasn't very satisfied with the outcome of that book. So, which is the ultimate mushroom guide?

Thanks!