[molochai]

Not who you asked but:

- Quiet - Susan Cain (introversion in general)

- Cues and Captivate - Vanessa Van Edwards (business-focused social skills)

- The Gentle Art of Verbal Self-Defense at Work - Suzette Haden Elgin (I actually didn't enjoy this one too much, didn't finish it, but I think that was a personal mismatch)

- How to Win Friends and Influence People - Dave Carnegie (a lot of the techniques are very, very dated and transparent when used today... but it's pretty foundational and worth a glance anyway)