The Book of the Month for my office is Mark Leader's "Distinguishing Marks of a Leader: How You Can Think, Act, and Earn Like a Leading Salesperson."
If you've ever taken one of Mark Leader's 3-month courses, you'll already know what is included in the book. If you haven't taken on of Mark's courses, then the book may be worth the read. "Distinguishing Marks" is basically divided into 3 main chapters. The first is on how leading salespeople THINK (the importance of positive thinking, etc.). The second is on what leading salespeople KNOW about various personalities and the importance of having a good home life. The third chapter is about what leading salespeople DO on a daily basis. I like the last chapter the best because it's all about managing your time effectively, being "of service" to others, and being passionate about whatever you choose to do.
The name of the book is a pretty cool play on words using Mark Leader's name. The book is about both real estate AND about leadership skills and can apply to any number of career choices in which sales is a part.
You may pick up a book at any decent bookstore and for more information about Mark Leader and/or his programs, check out www.LeadersChoice.com.
No, I am NOT affiliated with Leaders Choice and will not be getting any money for referring you to the site. :)