Tim Green fought ALS diagnosis until it nearly killed him, and now he's fighting back - The Athletic
League Of Denial Documents The NFL's Concussion Failures
Revisit Dallas Cowboy Star's Scary 1994 Concussion – 'Where Am I? … Did We Win?'
Modern history of American football - Wikipedia
49ers Linebacker Quits After 1 Season, Citing Safety Concerns
Love, Zac: Small-Town Football and the Life and Death of an American Boy
Stunning documentary, “League of Denial: The NFL's Concussion Crisis” – The Denver Post
Their Life's Work' Celebrates Steelers' Friendships
Concussion Research Slowed By Shortage Of Donated Brains : Shots - Health News : NPR
When It Comes To Brain Injury, Authors Say NFL Is In A 'League Of Denial'
Weighing In On 'League Of Denial'
CTE beyond the NFL: Everyday people seek help in a dubious brain health industry : NPR
Here's what we know about football, concussions, and the brain - Vox