I remember reading Dale Carnegie at High School and College. Both times, I was able to take large steps up : once public speaking in front of 400 people, and the other obtaining sponsorship for a student club. I was so pleased to find it again.
Rhetoric, persuasion, listening: pop psychology
For selling, persuading and simple negotiation, have a look at changingminds for a useful miscellany of tips and techniques.
Sensemaking: heavy duty psychology
The psychologist to turn to when we have to lead from the front in times is Karl Weick who gives us the SIR COPE acronym.
I think I might spill my drink over someone who actually spouted an elevator speech at me, but what do we say when someone asks us “What do we do?”