Here is all you need to know about unlocking the secrets of body language.
Knowledge gained from this book will help you to recognize positive signs from others, but more importantly, you can identify negative signals so that you can determine how to better react to them. It should help you in business relationships to "read" other people and, hopefully, gain an advantage.
It will also help you recognize in yourself how your body language may be read by others. You can learn to adapt your style and stance to reflect a different attitude if it would help a situation.