Robert B. Cialdini: Influence
Influence: The Psychology of Persuasion, from the back cover: “[...] distinguished psychologist [Cialdini] explains why some people are remarkably persuasive and how you can beat them at their own game. You’ll learn the six psychological secrets behind our powerful impulse to comply, how skilled persuaders use them without detection, how to defend yourself against them – and how to put those secrets to work in your own behalf.” (Via Niklas.)