NFL Thanksgiving: History behind Cowboys, Lions' annual holiday tradition
Which NFL team has the most losses on Thanksgiving Day ever?
Bills edge Lions on late field goal for Thanksgiving victory - The Japan Times
1980 Bears Lions Thanksgiving Classic
Lombardi put end to Packers' annual Thanksgiving clash with Detroit
On Thanksgiving, the NFL Faces a Collision of Crises - The Atlantic
Every NFL team's record in Thanksgiving games – NBC Sports Philadelphia
Focus: How did the Detroit Lions, Dallas Cowboys start playing football on Thanksgiving? – Orange County Register
The First Thanksgiving Day Football Game in Detroit
The History of the NFL on Thanksgiving - Gang Green Nation
Thanksgiving Day 1980: Shortest Overtime in NFL History – Bears vs Lions