Wires and gadgets are part of the NFL official's uniform – Football Zebras
A closer look at the rule changes the NFL is debating - The Washington Post
Even before kickoff, referees to make history in the Super Bowl
NFL's expedited replay process failed spectacularly on DeVonta Smith's catch in NFC Championship Game - CBS Boston
NFL May Soon Split Instant Replay Decisions Between NYC and LA
NFL Officials: Preparing for Success
Rams vs. Bucs Monday Night Football to have first NFL Black ref crew
NFL will open season with replacement officials
John Parry on calling Super Bowl 53, pass interference replay, more - Sports Illustrated
You Make The Call NFL Football Operations
NFL Line Judge Jeff Bergman is All Business