How We Sold 37,000+ Copies of Our Self-Published Book (and How Much We Made)https://medium.com/@yegg/37-617-copies-of-traction-by-the-numbers-what-we-made-and-how-much-it-cost-41ff675c5965 by justinmares • 11 years ago 18 2 11 years agoMEmedium.com