NFL Relaxes Restrictions on Jersey Numbers - The New York Times
Number (sports) - Wikipedia
NFL Changes Over The Next Decade (Expansion, Relocation, Rule Changes, Strategy)
NFL approves jersey number expansion, other 2021 rule changes
NFL passes new jersey rules, will allow more players to wear single-digit numbers
Tom Brady Eviscerates NFL Over New Jersey Number Rule Change, 'DUMB
NFL jersey number restrictions may change after team proposal
NFL jersey numbers: Owners approve rule change for 2021 - Sports Illustrated
Cincinnati Bengals reveal uniform numbers for new players
The NFL's 6 new rules for the 2021 season, explained
Updates: Diggs One Of Several Jersey # Changes