The Rules of the Draft NFL Football Operations
Tom Brady rips NFL's new jersey number rule before Cowboys game - Sports Illustrated
NFL jersey number restrictions could change for running backs, receivers, tight ends, linebackers, defensive backs
Why some NFL players switched to single-digit jersey numbers - Sports Illustrated
Brian Burns changes jersey number to 0
NFL rumors 2021: Proposed rule allowing more players to wear single digits 'likely to pass' (report)
New NFL jersey rules let some players pick new numbers — if they pay - Marketplace
13 historical connections for the Patriots' new jersey numbers - Pats Pulpit
Breaking down the NFL's 6 new rules for 2021 season - Pride Of Detroit