I loved body language by Allan and Barbara Pease. It is short, to the point and has nice diagrams.

http://www.amazon.com/The-Definitive-Book-Body-Language/dp/0...

100 times yes. This book is amazing for this[1]. You can skim it online[2], but I highly suggest getting a real copy. There are so many things to pay attention to, but one of the greatest realizations for me was that your body language can and does affect other people's, even if they are not aware of it.

[1] http://www.amazon.com/The-Definitive-Book-Body-Language/dp/0...

[2] http://www.slideshare.net/anhnguyet_hro/the-definitive-booko...

Consider reading these: http://www.amazon.com/What-Every-BODY-Saying-Speed-Reading/d... http://www.amazon.com/Definitive-Book-Body-Language/dp/05538...

This is a copy of, or at least heavily-based on: http://www.amazon.com/Definitive-Book-Body-Language/dp/05538...

How do I know? I've read it. It's a good, light-hearted, book although there may be better on the subject.

I found "The Definitive Book of Body Language" very helpful. (http://www.amazon.com/Definitive-Book-Body-Language/dp/05538...)

Influence: The Psychology of Persuasion http://www.amazon.com/Influence-Psychology-Persuasion-Busine...

The Definitive Book of Body Language http://www.amazon.com/Definitive-Book-Body-Language/dp/05538...

+1 to How to Win Friends & Influence People