Wires and gadgets are part of the NFL official's uniform – Football Zebras
Officiating crews for the 2021 season – Football Zebras
Super Bowl 2020 referee, officials: Who is assigned to 49ers vs. Chiefs?
The Future Of Replay In The NFL May Include Referees Watching The Game On TV Like Fans
NFL's replay center behind the scenes: How league tackles close calls
NFL replay booth to undergo 'configuration changes' as dozens are dismissed – Football Zebras
History of Instant Replay
We Have A Problem - And The Valley Shook
NFL Officials: Preparing for Success
For ACC and power conferences, off-site help on football replay reviews is now essential
NFL officials have been off their game this season - The Boston Globe
Officials' Responsibilities & Positions