From the Chronicle of Higher Education,
As e-reading devices gain popularity, professors and students are struggling to adapt them to an academic fundamental: proper citations, which other scholars can use.
The trouble is that in electronic formats, there are no fixed pages. The Kindle, developed by Amazon, does away with page numbers entirely. Along with other e-book readers, the Kindle allows users to change font style and size, so the number of words on a screen can vary. Instead of pages, it uses “location numbers” that relate to a specific part of a book.