SMG: Why do we have instant replay?
Instant replay sends a bad message - The Washington Post
NFL makes pass-interference calls (and noncalls) reviewable - Los Angeles Times
The Case Against Instant Replay — All Instant Replay
Replay review in gridiron football - Wikipedia
The NFL has an instant replay camera problem
College Football Is Back. Don't Even Try That Fake Slide. - The New York Times
Has The NFL's Instant Replay Run Its Course?
Several NFL Teams Propose Rule Changes To Add More Instant Replay
World Cup Doesn't Need Replay; It Needs Fairplay : Show Me Your Cleats! - World Cup 2010 Blog : NPR
History of Instant Replay
Bill Belichick: Why not let coaches challenge everything? - NBC Sports
T-Time: Instant replay is ruining sports - Daily Trojan
Introducing Spiideo REPLAY Pro: Game-changing Instant Replays - Spiideo