NFL, NFLPA: Concussion protocol modifications 'are needed to enhance player safety' - The Athletic
2021 NFL CBA negotiations - The nine biggest looming issues - ESPN
NFLPA agrees to concussion protocol changes, NFL responds - ESPN
The NFL concussion protocol cannot save football
NFL Return-To-Participation Protocol
Following review of the handling of Tua Tagovailoa's injury, NFL, NFLPA agree 'the outcome in this case is not what was intended' - ESPN
NFL agrees to pay $765M to settle concussion suits - The San Diego Union -Tribune
NFL making significant changes to concussion protocol - ESPN
The NFL's concussion protocol problem – The Prospector
NFL-NFLPA agree to a change in concussion protocols
Bennet Omalu, Concussions, and the NFL: How One Doctor Changed Football Forever
NFL's concussion protocol modified after Tagovailoa review