When you request an e-book, you’ll receive it in three file formats: EPUB, MOBI, and PDF. E-books are accompanied by a README file with instructions for installation on the more popular platforms. For EPUB, you can use iBooks on your iPhone/iPad/iPod Touch and Aldiko or Cool Reader on your Android devices. (Note that EPUBs containing video are only supported in iBooks on iOS devices.) MOBI works on all Kindle models, and Kindle for Mac or PC. PDFs can be read on Adobe Acrobat or Preview as well as Sony Reader and Nook devices.