2021 NFL rule changes: Expanded jersey numbers among 6 new rules
NFL rule changes: No booth review for roughing the passer
Vikings' Dalvin Cook, Patrick Peterson Pitch New Jersey Numbers
NFL rule changes: Modified instant replay, more positions allowed to wear single-digit jerseys - The Washington Post
Teams toss out 9 new rules proposals hoping some will stick – Football Zebras
The NFL's new single-digit jerseys are inspiring excitement and a little grumbling - The Washington Post
Tom Brady slams NFL's jersey number rule: 'Dumb'
NFL jersey number restrictions could change for running backs, receivers, tight ends, linebackers, defensive backs
NFL players, Jeff Okudah weigh in on proposed jersey number changes - Pride Of Detroit
Kansas City Chiefs Propose Rule Change to Loosen Jersey Number Restrictions - Sports Illustrated Kansas City Chiefs News, Analysis and More
Tom Brady slams NFL's jersey number rule: 'Dumb'