Why I Hate Instant Replays in Sports - WSJ
Hawk-Eye NFL Football Operations
Founding fathers of NFL instant replay scared where it's headed
A look at TV's instant replay through the years – The Denver Post
Replay review in gridiron football - Wikipedia
Flashback 1986: The NFL Adopts Instant Replay
NFL rule changes: Modified instant replay, more positions allowed to wear single-digit jerseys - The Washington Post
Has The NFL's Instant Replay Run Its Course?
PACKERVILLE, U.S.A.: Instant Replay (1968)
Replay Assistance Rule NFL Football Operations
The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors
These four states will use instant replay in some high school football game this fall. Here's how they'll do it.
NFL replay reviews, challenges drop with new rules and tech - ESPN