NFL jersey numbers: Owners approve rule change for 2021 - Sports Illustrated
How to Have a Plan in the NFL—and Not Mess It Up - The Ringer
The 'Code': Ten unwritten baseball rules you might not know
Dear NFL, Change The Uniform Number Rule - Turf Show Times
Column: Never a doubt NFL season would start; what happens now is a mystery, as usual - The San Diego Union-Tribune
NFL Football Operations on X: .@NFL owners approved a rule change proposed by the @Chiefs expanding jersey number options for certain positions. Check out the full list of 2021 rule changes
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NFL reportedly passes new jersey number rules: Who can wear what under revised guidelines