History of the Official NFL Football Operations
NFL makes history with all-Black officiating crew - Los Angeles Times
NFL's first all-Black officiating crew to work Rams vs Buccaneers
First all-Black NFL officiating crew to work Bucs game Monday
Johnny Grier, N.F.L.'s First Black Referee, Dies at 74 - The New
All-black officiating crew works NFL game for first time
First all-Black crew to make history officiating an NFL game
Referee And Rocket Scientist? Adrian Hill Talks About The Pressure
NFL to make history with first all-Black officiating crew in Week 11
Who is Sarah Thomas? The First Female Referee at the Super Bowl