The History of NFL Overtime Rules
NFL overtime rules: 'Extended period' OT is gaining momentum
How and why the NFL changed its OT rules - Sports Illustrated
The NFL's overtime rules, explained
Fans call for a change to NFL overtime rules
NFL overtime rules: How do they work?
NFL Playoff Overtime Rules: Here's How They Work - The Spun
NFL Overtime Rules: Explaining How It Works (And Why They're Dumb
Overtime rules for the NFL playoffs – Football Zebras
Steelers have a long history with OT rules, including 1st OT
Super Bowl LVII: Here's how the NFL's new overtime rules work
NFL overtime history: Revisiting the 12 playoff games that have
When overtime wasn't sudden death – Quirky Research
The NFL's new playoff overtime rules, explained