Chris Borland, Fearing for Health, Retires From the 49ers. At 24. - The New York Times
Chris Borland's early retirement shifts focus of head injuries in NFL - Los Angeles Times
Denver Broncos: David Bruton retires from NFL after 8 seasons
NFL uses Chris Borland retirement as opportunity to tout football safety
Chris Borland's Concussion Concerns, Retirement Are Latest Big Blows To NFL Business
San Francisco 49ers linebacker Chris Borland retires due to health fears, NFL News
Chris Borland's early NFL retirement has led to impact off the field - BVM Sports
Despite Chris Borland's retirement, football remains a personal choice in high school community - Washington Times
The Chris Borland Effect: He's Changed His Future, but Did He Change the NFL's?, News, Scores, Highlights, Stats, and Rumors
49ers linebacker Chris Borland retiring at 24 due to long-term health concerns
Borland Retirement: Is 24 Too Late to Stop Football Brain Damage?
NFL Shocker: 49ers' Borland Retires At 24 Over Head-Injury Fears - CBS New York
Athlete to Educator: Chris Borland wants to talk
Chris Borland stuns 49ers with retirement announcement
Bell: Young retirees should draw NFL's concern