The Tipping Point is about when trends become "viral." I don't think it has anything that could be applied to Greek recruitment.
Oh, and these books are older than the ones you're pushing:
Ready For Rush: The Must-Have Manual for Sorority Rushees
Rush: A Girl's Guide to Sorority Success
As I stated in another post, we really don't like stealth marketing here, and we are smart enough to pick up on it. So don't.