Las Vegas Raiders Official Team Website
League of Denial: The NFL, Concussions and the Battle for Truth: 9780770437541: Fainaru-Wada, Mark, Fainaru, Steve: Books
Concussions: Can cap keep football players' heads in game? – Orange County Register
ER Visits for Concussions Spike as Damage Becomes Clear
The Tragic Risks of American Football
Concussions and Brain Injuries in the NFL
Helmet Safety Unchanged as Injury Concerns Rise - The New York Times
VERIFY: CTE risk higher in kids under 14 in tackle football
This Helmet Will Save Football. Actually, Probably Not. - The New York Times