Gretchen Rubin is the bestselling author of The Happiness Project, Better Than Before, and The Four Tendencies. You won’t believe what she chose as her three most formative books.

Sarah Ramsey is my favorite bookseller in the world. What three books inspired her love for reading? Tune in to this Chapter of 3 Books to find out.

Seth Godin is the bestselling author of Linchpin, Purple Cow, Tribes and many more books and writes one of the most popular blogs in the world. Find out his three most formative books here.

Learn more about Frank Warren, founder of PostSecret, an art project inviting strangers to anonymously mail in their secrets on homemade postcards, and his three most formative books.