Which sport has the worst instant replay system? An investigation
Report: League installing real-time fiber optics for replay review - NBC Sports
A look at TV's instant replay through the years – The Denver Post
How Technology Has Changed Football
On Further Review, the NFL's Instant Replay is Finally Instant
The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors
NFL rule changes: Modified instant replay, more positions allowed to wear single-digit jerseys - The Washington Post
NFL replay reviews, challenges drop with new rules and tech - ESPN
March 11, 1986: NFL Adopts Instant Replay
Mara says replay reviews eventually could be conducted in command center - NBC Sports