NFL owners pass controversial rule among changes approved at annual owners meeting
NFL owners pass rule expanding eligible jersey numbers for certain positions' - is this a big deal? Why? - Quora
16 NFL players who could get new jersey numbers after rule change
Number (sports) - Wikipedia
NFL jersey number restrictions could change for running backs, receivers, tight ends, linebackers, defensive backs
NFL News: League Expands Eligible Jersey Numbers - Battle Red Blog
2021 NFL rule changes: Expanded jersey numbers among 6 new rules
NFL Relaxes Restrictions on Jersey Numbers - The New York Times
NFL rule changes 2023: No. 0 jersey is back, personal foul penalties clarified, one date for roster cutdowns