Not Convinced That Your Words, What You Say And How You Say It, Have A Powerful Impact On Your Health And Success? Then Read:

Should: How Habits of Language Shape Our Lives by Rebecca Smith:
http://www.amazon.com/Should-Habits-Language-Shape-Lives/dp/1931646856

What You Say Is What You Get: There's Dynamite in the Words You Speak! by Don Gossett:
http://www.amazon.com/exec/obidos/ASIN/0883680661

The Tongue: A Creative Force by Charles Capps:
http://www.amazon.com/exec/obidos/ASIN/0892740612