Amazon introducing new version of Kindle, the world's largest online retailer, plans to introduce the next version of its Kindle electronic-book reader in August, according to two people familiar with its plans.

The device will be thinner and have a more responsive screen with a sharper picture, said the people, who didn't want to be identified because the plans aren't public.

The new Kindle will not include a touch screen or color, they said. Amazon introduced the Kindle in 2007, but Apple's iPad color, touch-screen tablet has increased competition.