Ex-NFL players who played tackle football in youth more likely to have thinking, memory problems - ESPN
Youth Tackle Football Linked to Earlier Onset of Cognitive and Emotional Symptoms in Athletes Diagnosed with CTE After Death
Not Safe for Children? Football's Leaders Make Drastic Changes to Youth Game - The New York Times
Survey: Half of Americans says kids shouldn't play tackle football
Duerson Act' Would Ban Tackle Football for Illinois Kids Under Age 12, Chicago News
Youth Tackle Football Linked to Emotional Issues in Adulthood
Scientists Were Already Concerned About Kids Playing Tackle Football. It's Worse Than They Thought. – Mother Jones
Study: Tackle football should wait until high school
Safety Considerations for Youth Football
How Different Are Dogfighting and Football?