My ibook stopped downloading half way through, what do I do now?

The reason your ibook stopped downloading is because there was an interruption in your wifi signal. Try downloading the book again by clicking on the purchased tab in the iBooks app and clicking on the cloud icon next to the book. Alternatively you can download the book to iTunes on your computer and sync iBooks with your computer.  Please contact their support team at 1-800-275-2273.