NFL rule changes for 2021; jersey number expansion
The NFL Jersey Number Rule Explained - HowTheyPlay
The Chiefs proposed a new rule to reduce restrictions on jersey numbers - Niners Nation
Uniforms that should return in 2022 as NFL approves alternate helmets – The Swing of Things
NFL CBA approved - What players get in new deal, how expanded playoffs and schedule will work - ESPN
Tom Brady Eviscerates NFL Over New Jersey Number Rule Change, 'DUMB'
Football Jersey Numbers List
NFL owners approve several rules changes for 2021 season
NFL Approves Proposal That Loosens Restrictions on Jersey Numbers - Sports Illustrated Cincinnati Bengals News, Analysis and More
Calvin Ridley to be first to wear No. 0 after NFL rule change
Chargers News: NFL to allow alternate helmets starting in 2022 - Bolts From The Blue
Tracking all the new NFL uniforms and helmets for the 2022 season - ESPN