Think and Grow rich - Napoleon Hill
This book is a classic, and has been in circulation for quite a while.
I had seen many people recommend this book, so I finally decided to read it.
It clearly has influenced a lot of people, and the principles in this book are timeless. As the title suggests, the main theme of this book is how to change the way you think, and turn those thoughts into opportunities and actions to increase value and make you more money.
The book is mainly focussed on early American business success stories like the Carnegies with their steel business, and Henry Ford and his success with the Model T.
I highly recommend this book as it will give you a good understanding of the foundation principles of making money which are still prevalent today.