Modern Football Helmets Don't Do Very Much to Reduce Brain Injuries - The Atlantic
Football Concussions: Prevention, Diagnosis & Recovery
Guardian Caps Guardian Sports
Football helmet - Wikipedia
How Effective Are Football Helmets at Preventing Brain Injuries?
New football helmets could limit brain injuries
Wearing headgear for sport does not protect against concussion, Australian experts warn, Concussion in sport
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
The Science of Concussion and Brain Injury - Scientific American
Advancements in Football Helmet Technology - Information, resources and guides on Traumatic Brain Injury