What's really changed in the NFL's 'call to action' on concussions - ESPN
Head Trauma: The Worst Kept Secret On The Gridiron
Brain injuries, race and denial in the NFL, American Football News
Concussions in the NFL: How Worried are You?
Brain Trauma, the NFL, and Science: League of Denial (Part 3 of 9)
What the N.F.L. Says, and What It Doesn't, About Injuries - The New York Times
Brain injuries, race and denial in the NFL, American Football News
NFL to stop controversial use of 'race-norming' in brain trauma settlements, NFL
Timeline: The NFL's Concussion Crisis, League of Denial: The NFL's Concussion Crisis, FRONTLINE
NFL's head injury problems may be diagnosed, treated earlier
League of Denial: The NFL's Concussion Crisis
Former NFL players speak out about race-based concussion damage assessment
When It Comes To Brain Injury, Authors Say NFL Is In A 'League Of Denial' : NPR