49ers' Chris Borland retiring at 24, wary of head trauma
Borland: Young LB Steps Away, PFF News & Analysis
49ers' Chris Borland retires: NFL responds, cites safety progress - Los Angeles Times
NFL Players Retiring Early a Trend
49ers' Chris Borland retiring at 24, wary of head trauma, Nation & World
Chris Borland, Fearing for Health, Retires From the 49ers. At 24. - The New York Times
49ers linebacker, former Wisconsin star Chris Borland retiring from NFL after one season - Bucky's 5th Quarter
ABC7 SPORTS: 49ers player Chris Borland makes unprecedented retirement decision - ABC7 San Francisco
Chris Borland to retire from NFL, fearing concussions
Chris Borland retires from NFL at just 24 years old, makes his own sense of head injuries – New York Daily News
San Francisco 49ers LB Chris Borland to retire due to safety concerns - Sports Illustrated
Chris Borland - Wikipedia
Chris Borland stuns 49ers with retirement announcement
node:title] San Francisco 49ers Rookie Chris Borland Retires at 24 For Concussion Concerns - Men's Journal