- http://www.groundhog.org/
- http://en.wikipedia.org/wiki/Main_Page
- http://www.pinterest.com/theudgroundhog/
- https://www.juniorachievement.org/web/ja-usa/home
- http://www.prairiedogcoalition.org/
- http://kids.nationalgeographic.com/kids/
- http://pittsburgh.about.com/cs/punxsutawney/a/groundhog_day.htm
- http://wikieducator.org/
- http://www.punxsyhistory.org/
- http://www.timeanddate.com/holidays/canada/groundhog-day