NFL History: 100 objects that tell the story of football - Sports Illustrated
Week 2 referee assignments – Football Zebras
The Officiating Mess: Worse than Ever, or Just Louder Critics? - Sports Illustrated
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
When N.F.L. Zebras Chat With Lions and Giants and Bears - The New York Times
In addition to pass interference, replay is undergoing a 'configuration change' – Football Zebras
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
2019 NFL season - Wikipedia
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
The History of Football Games - GameSpot
In addition to pass interference, replay is undergoing a 'configuration change' – Football Zebras