WordPress ebook

I was searching for best WordPress eBook. I got may be best two-
1.Digging Into WordPres
2.Professional WordPress: Design and Development

I want to be expert on WordPress. Please suggest me which one should i collect and follow to reach my goal. If you know about others good eBook on WordPress, please suggest me.
Note: I have basic ideas on WordPress.

http://rockablepress.com/books/rockstar-wordpress-designer/

And

http://rockablepress.com/books/rockstar-wordpress-designer-2/

Those 2 books is really awesome, before you can read book number 2, u need Book number 1, book number 2 is going more in depth with the subject, and I’ve learned so much by reading them.

http://www.sitepoint.com/books/wordpress1/ one of sitepoints own books…

I would read those 3, maybe even both of those you listed, but the codex on wordpress’s website, is pretty good too, their forums is awesome, and yeah just jump into it, you learn a lot by doing!

But wordpress is a good subject to get into I think!

I would also recommend “Head First WordPress”. Whilst it may not quite make you an expert in WordPress it is a very good way of learning about WordPress and gives you solid foundations to build upon.