Gary Gygax himself also wrote a book on Role Playing:
Role-Playing Mastery, which is an excellent resource for the principles of generic role playing games. I'd give it a quick look and it may be a good source to cite. Having other books on the same topic does not detract from what you are doing, as you may be going about it in a different way, and a properly researched and cited book carries a lot more weight than a book that is just about your own thoughts and ideas about the hobby.
Good luck in your endeavor!