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Steve Strimling is the Cotton Bowl referee, blazing a trail for others - Outsports
Super Bowl Official Sarah Thomas Will Make History at Big Game
Ask Sam Farmer: Are there throwback uniforms for NFL officials? - Los Angeles Times
Why Football Referees Have Letters & Numbers – vIQtory Sports
Smitteez Sportswear
NFL referee Sarah Thomas doesn't have time for your nonsense - SBNation.com
How much money do NFL referees make? Salaries & pay structure for game officials in 2020 | Sporting News
NFL100: In 1979, the NFL renumbered its officials. After 3 years, they scrapped the failed plan | Football Zebras
The Gridiron Uniform Database
College football's most recognizable official, 'Beef Ref' Mike Defee leaves the game with a legacy - CBSSports.com
Smitty 2" Stripe Heavyweight Interlock Long Sleeve Football Referee Shirt with Position Plac… | Ump-Attire.com
Here's how much money NFL officials make working games | RSN
How Much Does an NFL Referee Make?
Why Football Referees Have Letters & Numbers – vIQtory Sports
SEC to experiment with 8 football officials, but what's right number? - CBSSports.com