Reading Poker Tells will teach you how a professional poker player analyzes the facial expressions, body posture, physical gestures, and verbal statements of his opponents.
Besides cataloging the meaning of the most common poker tells, this book gives an organizational framework for thinking about and remembering tells. It also contains information on general poker psychology, methods of deceiving and manipulating opponents, and methods for becoming "unreadable".
Released in 2012, it has been widely recognized by many poker players, both amateur and experienced, as being the best work on the subject. The author, Zachary Elwood, keeps a blog at www.readingpokertells.com.