This eBook comes in 3 different formats: Kindle (.mobi) PDF (.pdf) and ePub (.epub). To view the kindle version you will need to download the free Kindle Reader. When trying to use the kindle version on Android phones, try this link. For a PDF reader click here, for an epub reader click here. You may use only one or all 3 of these formats to read this eBook, and store in on any and all of your electronic devices but each purchase is only meant for one person/family.