Drive: The Surprising Truth About What Motivates Us by Daniel H. Pink.
Flip The Funnel: How to Use Existing Customers to Gain New Ones by Joseph Jaffe.
Linchpin: Are You Indispensable? by Seth Godin.
Presentation Zen Design: Simple Design Principles and Techniques to Enhance Your Presentations by Garr Reynolds. .
Switch: How to Change Things When Change is Hard by Chip & Dan Heath.
The Tipping Point. How Little Things Can Make a Big Difference by Malcolm Gladwell.