N.F.L. Overtime Rules: How it Works - The New York Times
American football rules - Wikipedia
NFL overtime playoff rules were changed. Here's how they work now.
NFL Overtime Rules: How does Overtime rule work in the NFL?
Three best ways to fix NFL overtime after Chiefs' wild playoff win
The NFL's overtime rule explained and why fans want to see it
N.F.L.'s New Overtime Rule Means Extra Choices - The New York Times
NFL overtime rules: How Super Bowl OT works, rule changes and more
Three teams voted against the NFL's new overtime rule, including
Breaking down the NFL's overtime rule and why fans want to see it
Super Bowl 2021: Here are the overtime rules in case of a tie
When overtime wasn't sudden death – Quirky Research
What happens in overtime in the Super Bowl? - The Washington Post
New NFL Playoff Overtime Rules Begin Today - Daily Norseman
NFL owners approve rule change for OT in playoffs