Who is credited for starting the Thanksgiving Day football tradition?
Focus: How did the Detroit Lions, Dallas Cowboys start playing football on Thanksgiving? – Orange County Register
NFL Thanksgiving: Detroit Lions and Dallas Cowboys uphold league's yearly tradition on US holiday, NFL News
During Lions Games, Giving Thanks While Gnashing Teeth - The New York Times
How to Watch Lions vs Bears on Thursday, November 25, 2021
Why we watch football on Thanksgiving
Thanksgiving and the NFL Pro Football Hall of Fame
Why do the NFL Lions and Cowboys play every Thanksgiving? - AS USA
Why do we play on Thanksgiving Day?