There are many authorities on the actual Groundhog Day movie. We’ve provided links below to get you started on becoming an expert on all things Groundhog Day.

The Subtle Brilliance of ‘Groundhog Day’: How religion, Belgian pop music, and Rachmaninoff elevate the Bill Murray classic

Internet Movie Database

Wikipedia

WikiQuote features quotes from the movie

Thoughts on Groundhog Day – Southwest Airlines Blog