Reddit mentions of The Psychology of Selling: Increase Your Sales Faster and Easier Than You Ever Thought Possible

A good place to start might be The Psychology of Selling by Brian Tracy

www.amazon.com/The-Psychology-Selling-Increase-Possible/dp/0785288066

What Every Body is Saying by Joe Navarro

http://www.psychologytoday.com/experts/joe-navarro-ma

How to Win Friends and Influence People by Dale Carnegie

http://salesfocusinc.com/sales-tips/read-the-classics-dale-carnegies-how-to-win-friends-and-influence-people-and-his-contributions-to-modern-sales-advice/

Here at the links to the books I have recommended.

https://www.amazon.com/Art-Selling-Zig-Ziglar-2012-06-03/dp/B01F81PFOG/ref=sr_1_2?ie=UTF8&qid=1488290235&sr=8-2&keywords=zig+ziglar+art+of+selling

https://www.amazon.com/Psychology-Selling-Increase-Thought-Possible/dp/0785288066/ref=sr_1_5?ie=UTF8&qid=1488290247&sr=8-5&keywords=brian+tracy

https://www.amazon.com/Predictable-Revenue-Business-Practices-Salesforce-com/dp/0984380213/ref=sr_1_1?ie=UTF8&qid=1488290267&sr=8-1&keywords=predictive+revenue

This is highly recommended for anyone in Saas sales.

especially in a BDR or management role.

https://www.amazon.com/SPIN-Selling-Neil-Rackham/dp/0070511136/ref=sr_1_1?ie=UTF8&qid=1488290305&sr=8-1&keywords=spin+selling