Which is a good book on how to improve your communication skills? And improving

Question:

Which is a good book on how to improve your communication skills? And improving your self confidence?

Best Answer - Chosen by Asker: I usually use http://www.bartleby.com/64/ as a reference when I'm at work for English usage. For confidence, I believe, as long as you know what you're talking about and you can express it well, you're good to go.