NFL owners approve rule change for OT in playoffs - The San Diego Union-Tribune
American football rules - Wikipedia
The NFL's overtime rule explained and why fans want to see it changed
How do NFL overtime rules work in the Super Bowl? - The San Diego Union-Tribune
The NFL's overtime rules, explained
NFL Overtime Rules NFL Football Operations
NFL fans agree Bills vs Chiefs was the best Divisional Round game but are split on overtime rules - Stampede Blue
NFL overtime rules for playoffs, explained: How is winner determined?
Owners to consider a variety of rules changes at NFL meetings this week - Los Angeles Times