Official (gridiron football) - Wikipedia
Who are the next white hats? – Football Zebras
How Much Does an NFL Referee Make?
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NFL officials honor late colleague with patch on hats – Football Zebras
Upstate NY native Maia Chaka makes history as NFL's first Black female referee - syracuse.com
The NFL's 'all-star' officiating crews are ruining the playoffs - The Boston Globe
Ed Hochuli, N.F.L. Referee, Has Long Had Fan Support - The New York Times
NFL female referees: How many are there and what do they make per game - NBC Sports Boston
NFL first marked with whistle and hat | Pro Football Hall of Fame Official Site
NFL Referees Association Releases Statement To Address Damar Hamlin Situation - AthlonSports.com | Expert Predictions, Picks, and Previews
NFL's First All-Black Crew Officiated 'Monday Night Football' Game : NPR
Here's how much NFL referees get paid
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