XFL 2023: Rules, player salaries and everything you need to know - ESPN
The NFL's 'all-star' officiating crews are ruining the playoffs - The Boston Globe
The 2021 NFL season is here. Here's your complete guide - The Boston Globe
2023 Rules Changes and Points of Clarification
NFL refs will talk to officiating office during replay reviews - NBC Sports
Rodney Harrison, Chris Simms rip NFL for Dre Greenlaw's ejection – NBC Sports Bay Area & California
Fox's Pereira knows pressure Super Bowl officials are facing
NFL's head of officiating will make all replay decisions - NBC Sports
NFL considering adding booth umpire and more to help on replays - Newsday