NFL, Players Union Agree to Change Concussion Protocol - The New York Times
Health issues in American football - Wikipedia
CTE In Athletes Linked To Hits To The Head, Even Without Concussions : Shots - Health News : NPR
The link between head injuries and CTE in football, explained - Vox
Tua Tagovailoa's head injury puts NFL concussion protocol under scrutiny - The Washington Post
Why are guys on TV laughing about Anthony Davis' injury? - Los Angeles Times
UCLA's Dorian Thompson-Robinson on track to play in Sun Bowl - Los Angeles Times
NFL Head-Trauma Lawsuit: What It Means for TV's $50 Billion Business – The Hollywood Reporter
League of Denial: The NFL, Concussions and the Battle for Truth: 9780770437541: Fainaru-Wada, Mark, Fainaru, Steve: Books
Are Player Safety Concerns Putting the NFL's Future in Jeopardy?, News, Scores, Highlights, Stats, and Rumors
Injuries make the NFL a brutal sport. But the violence is partly why fans love it
NFL's head injury problems may be diagnosed, treated earlier