A History of Fatal Sports Fan Violence
Evolution of the NFL Player
Violence is not what's special about football
N.F.L. Playoff Predictions: Our Picks in the Divisional Round - The New York Times
Who are the AZ Ultras who attacked West Ham fans… but were held off by just two supporters?
How NFL Blitz Became the Best Arcade Football Game Ever Made
Football Injuries Cost Over £500 Million a Year as Premier League Tops Table - Bloomberg
The Rising Fear of Brain Injuries in School Sports - The Atlantic
Is the NFL too violent to continue as a mainstream sport? - Quora
NFL season is here but I won't be following anymore. I can't un-see the harm it causes, NFL
Steelers-Bengals marred by worrying injuries on brutal, ugly night for NFL, NFL