NFL number changes: Players who have switched jersey numbers 2022
NFL Jersey Numbers NFL Football Operations
Uniform number (American football) - Wikipedia
Full list of NFL players wearing 0 jersey number in 2023, from Calvin Ridley to D'Andre Swift
NFL rule changes for 2021; jersey number expansion
NFL likely to pass rule allowing more single-digit jersey numbers
NFL rule changes you should know as the 2023 season kicks off - ESPN
Tracking all the new NFL uniforms and helmets for the 2022 season - ESPN
NFL jersey numbers: Owners approve rule change for 2021 - Sports Illustrated
New NFL jersey rules let some players pick new numbers — if they pay - Marketplace