A non-fiction book is always a good reference however, it would need to be based on the true story. When you choose to use a non-fiction book make sure that the Book you are using aligns with historical facts.For most things use a text book with information you know is entirely accurate. To check do research online and if multiple sources match then its likely to be accurate.
In the Wealth of Nations, Smith writes about an "invisible hand." the best answer to describe this invisible hand is A) a guid that ensures that people produce the things that society needs. This idea was the basis for market capitalism.
