NFL has a new name for the head linesman position: down judge – Football Zebras
Why Mike Pereira agrees with Aaron Rodgers' take on state of NFL officiating – NBC Sports Chicago
Behind the scenes at the NFL's new replay review center in New York - Sports Illustrated
WATCH: Premier League release audio recordings of VAR reviewing Luis Diaz goal (video) - NBC Sports
NFL may make ejections subject to replay review - NBC Sports
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
MNF Officials Make Questionable 'Roughing The Passer' Call
Here's a guide to targeting in college football and the NFL – NBC Sports Chicago
NFL considering adding booth umpire and more to help on replays - Newsday
NFL Referee Salary: How Much They Make + Super Bowl Bonus
No matter what the NFL does, its officiating headaches just won't go away – The Denver Post
NFL refs roster includes 1st female instant replay official