DUMB': Tampa Bay Bucs' Tom Brady blasts new NFL uniform number rule, NFL
Player Numbering System Explained in U.S. Soccer - What is a 6 anyway?
The NFL's new single-digit jerseys are inspiring excitement and a little grumbling - The Washington Post
NFL passes jersey number expansion rule, meaning more single digits are coming - Acme Packing Company
NFL jersey numbers: Here's a running list of players who have decided to make a switch beginning in 2021
NFL jersey number rule change could bring back some classic college football looks for Derrick Henry, Jalen Ramsey and others - ESPN
NFL jersey number restrictions may change after team proposal
NFL uniform rules and regulations are strict, in a good way - Sports Illustrated
Did Tee Higgins Change His Number? Bengals WR Explains His Jersey Number Swap
10 unwritten rules for not screwing up your NFL jersey number