UPDATED: NFL officials snuck an illegal challenge into Seahawks vs. Lions - Pride Of Detroit
Who is the female referee in Super Bowl 2021? Meet Sarah Thomas, the NFL's first woman official
Upon further review, NFL officiating is in 'decline'
Carl Cheffers, Super Bowl referee, has history of penalties vs. Chiefs - The Washington Post
NFL officiating is under fire, putting the Super Bowl crew in the spotlight - The Athletic
Procedures for assigning mixed crews for the NFL playoffs – Football Zebras
Do NFL players, coaches face fines for criticizing officials? - ESPN - NFL Nation- ESPN
NFL refuses to hold officials accountable for erroneous whistle in Bengals-Raiders game : r/nfl
Super Bowl 51: Mike Pereira on Officiating the Super Bowl – Rolling Stone
NFL plans to hire first female referee for regular-season duty - The Boston Globe
2023 Super Bowl: who is the referee and officiating crew? - AS USA
Super Bowl LV officiating crew: Carl Cheffers named referee, Sarah Thomas to make history
Officiating Development NFL Football Operations
NFL's referee turnover could create some sticky situations this fall - The Boston Globe