This eBook comes in two different formats: Kindle (.mobi) and PDF (.pdf). To view the kindle (.mobi) version you will need to download the free Kindle Reader. For Android phones, the moon+reader software is a good alternaitve to the Kindle Reader. For a PDF  reader click here. You may use only one or both 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.