Which one book had the biggest impact in your success?

If you had to pick just one, which book would you say had the most positive impact for your career / business success.

My own vote would be for The Art of Pitch by Peter Coughter.

Even though it's not a book, Paul Graham's Startup in 13 Sentences gets my vote.

1. Pick good cofounders.
2. Launch fast.
3. Let your idea evolve.
4. Understand your users.
5. Better to make a few users love you than a lot ambivalent.
6. Offer surprisingly good customer service.
7. You make what you measure.
8. Spend little.
9. Get ramen profitable.
10. Avoid distractions.
11. Don't get demoralized.
12. Don't give up.
13. Deals fall through.