American football rules - Wikipedia
Colts, Eagles, Titans propose new NFL overtime rules: Here's what they're looking to change in 2022
The NFL's 6 new rules for the 2021 season, explained
New NFL overtime rules, explained: How Bills vs. Chiefs helped change playoff OT format
Does the NFL need to change its overtime rules? : NPR
NFL owners approve rule change for overtime in the playoffs
NFL Overtime Rules: Sham or Glam? - The Phoenix
Report: Colts submit proposal to change overtime rules after playoff complaints
NFL Owners to Vote on 15 Potential Rule Changes, Including Overtime Length, News, Scores, Highlights, Stats, and Rumors