Football-related head injuries causing concern among Arizona parents
How Helmets Have Evolved to Prevent Football Concussions - Chester County Hospital
Comparing Head Impacts in Youth Tackle and Flag Football, Concussion, Traumatic Brain Injury
Head Trauma: The Worst Kept Secret On The Gridiron
NFL helmet maker helping curb soldiers' head injuries
Football helmet joins fight vs. head injuries - The Boston Globe
Helmet Innovation: More and Better Choices, Fewer Concussions
Beyond the Helmet: Protecting the Brain of Your Athlete
Guardian Cap used by football teams to protect against head injury – The Denver Post
Defensive and offensive game plan for traumatic brain injury - UT Physicians
Football Helmets Do Little to Protect Against Concussions: Study
Microlattice Material Looks To Cut Football Head Injuries
Study: Newer Football Helmets Could Slash Concussion Risks
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN