Best NL Hold Em Book

[SeesTheRiver]

I am trying to improve my game. I am mainly an online player. But what book would everyone prefer to improve your game a lot.

[Photoc]

You should go to the book section of this forum for this answer and do a search. It's been asked and answered 1 or 2 times in there this year. /images/graemlins/wink.gif