Below are a list of resources that I recommend/discuss at my talks.
I've personally read them all and see the value in implementing what they teach.
3 DESK SET OF FLASH CARDS
The flash cards were a GAME CHANGER for me!
The book was good it was just too much, too fast. Think of how it was in school, we were given books to read but we made flash cards to master the material.
Microexpressions are like Body Language for the face.
They last only fractions of a second but reveal a great deal of information. If you've ever watched the TV show "Lie to Me" it's about Microexpressions