Officials question NFL's process for selecting Super Bowl referee
NFL Replay Officials NFL Football Operations
John Parry will be referee for Super Bowl 53 between Patriots and Rams - Pats Pulpit
Nothing 'part time' about Ed Hochuli's approach to game as NFL's most famous referee
NFL fixed grades for desired Super Bowl ref – Football Zebras
Sarah Thomas to become first female official in Super Bowl history
Who is the female referee in Super Bowl 2021? Meet Sarah Thomas, the NFL's first woman official
Whispering in the ear of NFL referees - ESPN - NFL Nation- ESPN
Super Bowl 51: Mike Pereira on Officiating the Super Bowl – Rolling Stone