Harry - He put in the apostrophe because he's using the possessive form - the readers possess the approach - although I think he should use the plural possessive: readers' because their are many Mobipocket format readers -
just saying
- just teasing - your English is usually impeccable, I wish I could do as well
boswd - Harry is right, those page numbers are just as virtual and arbitrary as the Kindle's locations. Actually more so, because they are calculated based on the compressed file, not the original file.