Robert B. Cialdini

Influence

Influence : The Psychology of Persuasion (New and Expanded)

Influence and Persuasion (HBR Emotional Intelligence Series)

HBR's 10 Must Reads for New Managers (with bonus article “How Managers Become Leaders” by Michael D. Watkins) (HBR's 10 Must Reads)

Pre-Suasion

HBR's 10 Must Reads on Communication (with featured article "The Necessary Art of Persuasion," by Jay A. Conger)