First all-Black NFL officiating crew to work Monday Night Football game - ESPN
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
Mechanics – Page 3 – Football Zebras
NFL 100: At No. 3, Jerry Rice and the rookie season that launched a legend - The Athletic
NFL100: Before they were zebras, they were … candy canes? – Football Zebras
NFL100: Before they were zebras, they were … candy canes? – Football Zebras
Evolution of the game: The past decades have seen multiple changes to make NFL action more compelling
NFL history: 100 people who shaped the league, pro football - Sports Illustrated
NFL's First All-Black Crew Officiated 'Monday Night Football' Game : NPR
NFL100: The expansion of officiating crews followed the evolution of the game – Football Zebras
NFL100: Before they were zebras, they were … candy canes? – Football Zebras