On the off chance that you can read German, I recommend
Sagen, Legenden und Geschichten aus der Fränkischen Schweiz - 581 tales of witches, ghosts, superstitions, magic, fiery apparitions, big fish (
really big fish!), the Wild Hunt, and little grey men, with the Devil as a frequent guest star. Most of them were told to the author by old locals who had been handed them down from their ancestors for many generations, and are thus quite authentic.
You can get this book from the
German Amazon site, though I can make no gurantees if you can get the book in time for your paper...
Personally, I'm currently trying to do a RPG treatment of many of the creatures for a Pyramid magazine article.