There are werewolf legends that date back to ancient Greece and Rome! You can use this project as a chance to broaden your werewolf awareness.
Research Tip: Start with the Wikipedia article on Werewolves, and then take a look at this online book: The Book of Were-Wolves by Sabine Baring-Gould.
There are also some chapters about werewolves in Human Animals by Frank Hamel. For the German werewolf tradition, Dan Ashliman has published some translations here: Werewolf Legends from Germany.