Tech: A closer look at the NFL's instant replay camera work
The Invention of Instant Replay Lemelson Center for the Study of Invention and Innovation
The history of the NFL's instant replay system - Sound & Video Contractor
The History of Instant Replay in the NFL, News, Scores, Highlights, Stats, and Rumors
How instant replay has revolutioned sports on TV – The Denver Post
NFL May Soon Split Instant Replay Decisions Between NYC and LA
EDGE Instant Replay System – Sport Scope Video
On Further Review, the NFL's Instant Replay is Finally Instant
These four states will use instant replay in some high school football game this fall. Here's how they'll do it.
Inside the often-chaotic NFL challenge process - ESPN