Writer Karen McQuestion spent nearly a decade trying without success to persuade a New York publisher to print one of her books. In July, the 49-year-old mother of three decided to publish it herself, online.

Eleven months later, Ms. McQuestion has sold 36,000 e-books through Amazon.com Inc.'s Kindle e-bookstore and has a film option with a Hollywood producer. In August, Amazon will publish a paperback version of her first novel, "A Scattered Life," about a friendship triangle among three women in small-town Wisconsin.

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