Using Instant Replay to Challenge a Call in American Football - dummies
On Further Review, the NFL's Instant Replay is Finally Instant
Here's a guide to targeting in college football and the NFL – NBC Sports Chicago
Upon further review, NFL's replay system could remain intact - The Boston Globe
Players Can Now Wear No. 0 as Part of NFL Rule Changes
NFL Rule Changes 2023: League will consider 17 proposals in league meetings — but not pushing the ball carrier - Arrowhead Pride
Replay review in gridiron football - Wikipedia
History of Instant Replay
The NFL's 3 changes under the hood of replay that could have mixed results – Football Zebras
Can you challenge pass interference in the NFL? Replay rules and more about OPI, DPI in 2020
Has The NFL's Instant Replay Run Its Course?
When the Whole Country Reviews a Play, Referees Can't Always Join - The New York Times