NFL replay reviews, challenges drop with new rules and tech - ESPN
On Further Review, the NFL's Instant Replay is Finally Instant
No momentum for big instant replay rule changes – Football Zebras
On Further Review, the NFL's Instant Replay is Finally Instant
The NFL has an instant replay camera problem
Upon Further Review: The NFL's Replay Review — Review Party Dot Com
History of Instant Replay
The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors
Under further review: Instant replay and the human element of umpiring
The NFL has an instant replay camera problem