Ghosts in the Machine will give you a better understanding of the human beings you are communicating with and the hidden drivers behind the sometimes irrational decisions they make, decreasing their resistance to you and increasing your effectiveness in selling to them. $0.99 on Kindle.
Ghosts in the Machine: Overcoming Decision-Making Bias in the Sales Cycle with Behavioral Science
Thinking Guide for Busy People
Thinking Guide for Busy People describes the subtle decision making mistakes that most people make and provides practical advice on how to avoid these mistakes. The book is shorter and easier to read than other books on the same topic, for example, Thinking Fast and Slow by Daniel Kahneman. $2.99 on Kindle.