Here's a guide to targeting in college football and the NFL – NBC Sports Chicago
An ending for the ages': Punt Bama Punt, 50 years later - Auburn University Athletics
NFL100: 30 years ago instant replay helped decide the outcome of a game … and it wasn't pretty – Football Zebras
History of Instant Replay
MLB's strong San Francisco bench allows game to thrive digitally
The Call That CHANGED Instant Replay FOREVER
The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors
MLB tells umpire crew it mistakenly used replay - The San Diego Union-Tribune
NFL100: 30 years ago instant replay helped decide the outcome of a game … and it wasn't pretty – Football Zebras