Can anybody comment on "Influence: The Psychology of Persuasion (Collins Business Essentials)"? I can't tell if it's a self-help type book or not...
See: http://en.wikipedia.org/wiki/Influence_Science_and_Practice
it's basically a series of case studies about how different external factors influence people's decision making. there's chapters full of examples on things like social proof, liking, reciprocity, etc.