Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
Arizona Cardinals unveil alternate black helmets with black facemask and metallic 3-D birdhead for 2022 season
Helmet-to-Helmet Hits in N.F.L. Haven't Diminished, but Penalty Flags Have - The New York Times
Football Helmet Misconceptions: Q&A
NFL takes first-ever step to ban some helmets after testing - The San Diego Union-Tribune
Cam Rising Will Be Wearing New Technology Helmet In 2022
New helmet design can deal with sports' twists and turns
Where did Washington Commanders come from? Here's the story behind every NFL team name
Meet Four Men Who Broke The NFL's Color Line
Head Injuries & American Football - Ethics Unwrapped
We Can Make Football Safer - Scientific American
History of the NFL Helmet
The Future of NFL Defenses Lies in a Lime-Green Dot - The Ringer