Brian & Shimrod, where to look? The web's not a lot of use unless you want the tradition of fantasy role playing (!)...but there are a number of academic libraries that list acquisitions on the subject, including UCL, Cardiff, & LSE (of all places), and a good social anthropology department could be a likely starting point if you really are wanting to research it further. My own brief contact with the subject began with A - level latin and that was along time ago to be quoting sources, but the werefox reference stuck in the mind and now that you've asked the question, I will try to dredge up more. I wasn't suggesting that it had formed the subject for song, though it might well have done, only that it existed.