History of Instant Replay
The 5 O'Clock Club: How instant replay is killing the NFL - Hogs Haven
NFL Notes: Time to 'start over' but where to begin?
NFL refs and instant replay are destroying the league
Hawk-Eye NFL Football Operations
NFL's instant replay officials have new powers, but owners weren't interested in other major rules changes - The Boston Globe
Tackling Tech: An Inside Look at NFL Instant Replay for 2017
The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors