I'm reading a really great book called The Yes Factor by Tonya Reiman. This book is really good. Its all about getting a "Yes!" from a target.
The areas of influence include body language, facial gestures (nod to Paul Ekman), hypnosis, Yes sets, proximics, NLP and appearance.
I have to recommend this book to anyone in PUA.
This is also an excellent resource for anyone who is interested in Sexual Framing or SS or any other kind of covert persuasion tactics.