NFL Owners Approve Replay Rule Changes, Among Others for 2021 Season
NFL Replay Officials NFL Football Operations
New replay rule makes for a smoother game – Football Zebras
NFL referee assignments Week 10: Who are the officials for every game this week?
NFL Rule Change: Officials Now Able To Replay Failed Fourth Down Attempts
NFL Sky Judge: How the New Process Works + Impact on Games
How NFL rule changes for 2021 will impact the game - Fewer low blocks, expanded review and balanced holding calls - ESPN
New replay rule makes for a smoother game – Football Zebras
Upon further review, NFL's replay system could remain intact - The Boston Globe