From history books to self-help, these books will keep you sharp. : Today's most successful leaders, from Bill Gates to Richard Branson, have one thing in common: They're all avid readers, using books to stay sharp and in the know. CNBC Make It has gathered 10 business and career books suggested by some of the world's most successful people in 2018. From former President Barack Obama to billionaire Mark Cuban, here are the books these leaders have recommended this year that will give you the edge you need.