When you purchase eBooks be sure to add the correct format (ie. ePub, mobi, or pdf) you require to your basket before checking out. The eBook will show up in your account, and you can then download it to the device of your choice. Be aware that once you have made your selection you cannot go back and download it again in another format. This would require a separate purchase.
Kindle users please note that eBooks should be downloaded in the mobi format.
Users of Apple devices eg. iPhone, iPod touch and iPad, as well as other eReaders eg. Nook, should download eBooks in the ePub format. Note that if you have the Kindle app running on an Apple device, you can choose a mobi format download and use the file sharing feature within iTunes to read it on the Kindle app.