Open eBook (.ePub) is the recommended choice for iPhone, iPod Touch, iPad, most Sony Readers, and Kobo e-readers.
If you have a Kindle, refer to this article: Amazon Kindle Help
Adobe Acrobat (.pdf) is the recommended choice for reading on your Macintosh, Windows PC, Windows Tablet, NOOK, and Android devices. You can download Adobe Reader here.
Our audiobooks are .mp3 files that download as a zip file.