Ask HN: Quick. . . What's the best book on entrepreneurship you've ever read?

I'm a young entrepeneur just getting my feet wet in business. I realize at this stage that I'm probably very naive in various aspects of business, but I figure that there's many a seasoned entrepreneur out there that has plenty of wisdom to share with others less experienced. Basically I would just like to read something from someone who has made mistakes so I won't have to repeat them.

Any recommendations from anyone in hacker-land?