A Solution for Awful N.F.L. Officiating? Simplify the Rules - The New York Times
Surprise: The enemy of officiating – Football Zebras
NFL history: 100 people who shaped the league, pro football - Sports Illustrated
Pro Football Hall of Famer Jim Brown dead at 87
NFL Mackie Development Program
Chargers did not lose a yard to referee error prior to missed field goal – Football Zebras
When N.F.L. Zebras Chat With Lions and Giants and Bears - The New York Times
NFL100: Officials used to use only one ball for a game – Football Zebras
NFL100: Before they were zebras, they were … candy canes? – Football Zebras
8th on-field official is not likely to be implemented soon in the NFL, if ever – Football Zebras
Week 7 officiating video: legal blocks, instant replay, 10 second run-offs, and illegal celebrations – Football Zebras
NFL100: Officials with the longest NFL tenure (30+ seasons) – Football Zebras
Week 1 officiating liveblog – Football Zebras
Evolution of the game: The past decades have seen multiple changes to make NFL action more compelling