Should Professional Sports use Replay?, by Matthew Schoenemann
Stung by Discord Over Officiating, the N.F.L. Puts a Coach in Charge - The New York Times
NFL Replay Officials NFL Football Operations
Officials' Responsibilities & Positions
NFL Referees Use Replay To Rescind Penalty Against Packers On Monday Night Football, Which No One Knew They Could Do : r/nfl
Wires and gadgets are part of the NFL official's uniform – Football Zebras
NFL Officials: Preparing for Success
Instant replay on table for NFL owners - The Boston Globe