Upon Further Review: A Brief History of Instant Replay
New replay rule makes for a smoother game – Football Zebras
NFL Replay Rules Remain Problem For Officials
NFL will partner with Hawk-Eye to enhance instant replay capabilities and shorten delays
LucidSportsFan: I know how to dramatically improve instant replay reviews in sports
The new NFL replay monitor tablets are going to be a problem
NFL should get rid of replay reviews entirely - Sports Illustrated
Has The NFL's Instant Replay Run Its Course?
Can you challenge pass interference in the NFL? Replay rules and more about OPI, DPI in 2020