Learning to draw Manga book suggestions?

I enjoy drawing in my spare time. Most of what I've drawn is just perspective buildings and things. Really just something to relax. But I would like to start doing some manga style drawings. Could someone suggest a good book or series of books to learn from? There seem to be alot of books out there to choose from.

How To Draw Manga
BOOK
http://www.howtodrawmanga.com/bookstore/shop.php

SITE
Drawing & Sketching

I know a thing of Japan of "how to Draw MANGA"

Thanks for the links. They're helpful