NFL Relaxes Restrictions on Jersey Numbers - The New York Times
How many players can dress for an NFL game? Revisiting the league's new rules and regulations for 2023
2021 N.F.L. Rule Changes: A Viewer's Guide - The New York Times
NFL stars excited by zero jersey number rule change
NFL jersey numbers: Owners approve rule change for 2021 - Sports Illustrated
NFL meetings: Players can wear 0, roughing the passer not reviewable
NFL rule changes: Players can now wear No. 0, and one already says he'll do it
NFL rule proposal would allow more players to wear single-digit numbers like in college football