Super Bowl 50: Agent says he brought concussion issue to NFL years ago, but 'No one listened' – The Times Herald
Former NFL Quarterback Ken Stabler Had CTE
NFL quarterback Kenny Stabler was suffering from severe brain disease
5 NFL Athletes Who Had CTE
Ex-NFL player Ken Stabler had concussion disease CTE
Football Players Diagnosed with CTE, the Brain Disease
NFL quarterback Kenny Stabler was suffering from severe brain disease
Column: Time for empathy about concussions in football
No question' that Raiders great Ken Stabler had brain disease CTE – doctors, NFL
Brain injury study suggests football at any level is risky
New research suggests intensity of hits in sports, not years played, may be better predictor of devastating brain damage - The Boston Globe
NFL Players Battle Concussions To Get To The Super Bowl Championship - CBS San Francisco
Ex-quarterback Ken Stabler suffered brain trauma - The Boston Globe
NFL concussion settlement leaves former players struggling for relief