What to read after Think and Grow Rich - Napoleon Hill's Thirteen Steps Toward Riches?

The inspiration for the bestselling self-help book, 'The Secret'. Napoleon Hill started it all. From the Author's Preface: "Long before I was born, the secret had found its way into the possession of Thomas A. Edison, and he used it so intelligently that he became the world's leading inventor, although he had but three months of schooling. The secret was passed on to a business associate of Mr. Edison. He used it so effectively that, although he was then making only $12,000 a year, he accumulated a great fortune, and retired from active business while still a young man. You will find his story at the beginning of the first chapter. It should convince you that riches are not beyond your reach, that you can still be what you wish to be, that money, fame, recognition and happiness can be had by all who are ready and determined to have these blessings. How do I know these things? You should have the answer before you finish this book. You may find it in the very first chapter, or on the last page."