Bill Leavy, officiating supervisor and referee, dies at 76 – Football Zebras
Good call: NFL brings the refs back - The Liberty Champion
Football Officials And Referee Types
NFL and Referees End Lockout
Regular NFL referees return to unprecedented reception during Ravens' win over Browns
NFL Referee Salary: How Much Do NFL Refs Make? (Updated 2023)
What to expect from NFL officiating in 2020 - coronavirus protocols, electronic whistles and inexperience - ESPN
Are the NFL Referees a Problem?
Inside the mind of the ref who blew Detroit Lions vs. Seahawks call
NFL considering adding booth umpire and more to help on replays - Newsday
Editorial: With real referees back, time for the NFL to focus on players, teams