In an effort to follow Apple’s new in-app selling rules which would require sellers to give Apple 30% of any content sold through apps, eBook retailers Amazon, Kobo and Barnes & Noble have stopped selling eBooks through its iPhone and iPad apps.

In order to purchase eBooks from these retailers to read on your iPhone or iPad, you now have to do so using a webpage on the device. (eBooks purchased through these apps will still exist in a user’s app). All of these apps have new updates in iTunes.

The Google Books app is also now curiously missing from the iTunes store. We assume it is being updated and will return without the ability to buy eBooks.