'Shoe Dog' by Phil Knight

Knight, the co-founder of Nike, released the first insider account of the world-famous retailer earlier this April.

Gates calls the book a "refreshingly honest" reminder that the road to success is never a straight line. It's a winding path rife with disagreements, fallouts, and hurt feelings.

"I've met Knight a few times over the years," Gates writes. "He's super nice, but he's also quiet and difficult to get to know. Here Knight opens up in a way few CEOs are willing to do."