The most successful leaders all have one thing in common: They've read How to Win Friends and Influence People. As a salesman at one point in his life, author Dale Carnegie made his sales territory the national leader for the firm he worked for.
Carnegie eventually ended his sales career and taught public speaking. Even Warren Buffet, one of the most successful investors of the 20th century, took Carnegie's course at age 20.
Fortunately for us, all the same lessons were packaged into the now-famous book, How to Win Friends and Influence People.