Wordpress-recommended books?

[Charliebee]

Ive decided to do more research on Wordpress and would like to purchase some books to read, anyone know any good books or ebooks i can look at?

Thanks

 

[tbwcf]

Check Digging into WordPress they have a useful blog and PDF book you can buy.

 

[Harry]

Also, just the Codex will have a lot of info for free: http://codex.wordpress.org/