Ask Sam Farmer: Are there throwback uniforms for NFL officials? - Los Angeles Times
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
Keeping up with the downs: Referee John Parry uses an old-school method for game administration – Football Zebras
How to Know What the Referee Is Signaling While Watching Football - Howcast
NFL referee Gene Steratore may have had longest penalty explanation ever (Video)
Football Officials And Referee Types
Steve Strimling is the Cotton Bowl referee, blazing a trail for others - Outsports
Ed Hochuli, N.F.L. Referee, Has Long Had Fan Support - The New York Times
What are the black string-like things football referees wear on their hands for? - Quora
College football referees have an impossible job. Here's why - Sports Illustrated
Euro 2020 has been largely free of referee outrage - the Premier League could learn a lot
What are the black string-like things football referees wear on their hands for? - Quora
Bill Belichick shows disdain for officiating with disgusted challenge flag spike
7 totally unique ways NFL officials have robbed Detroit Lions this decade