Chris Borland, San Francisco 49ers linebacker, retiring due to head trauma concerns - Newsday
Despite Chris Borland's retirement, football remains a personal choice in high school community - Washington Times
ABC7 SPORTS: 49ers player Chris Borland makes unprecedented retirement decision - ABC7 San Francisco
Real Men Quit Football. Chris Borland's shocking retirement…, by Aaron Leibowitz
node:title] San Francisco 49ers Rookie Chris Borland Retires at 24 For Concussion Concerns - Men's Journal
NFL Players Retiring Early a Trend
49ers' Chris Borland Retires at 24 Due to Concerns Over Head Trauma and Safety - TV Guide
Retiring 49er Chris Borland to pay back NFL signing bonus - Sports Illustrated
49ers' Chris Borland becomes latest young NFL star to retire early - Cincy Jungle
San Francisco 49ers' Chris Borland Retires at 24 Over Concussion and Brain Trauma Worries - The Atlantic
49ers' Chris Borland retiring at 24, wary of head trauma, Nation & World
NFL Player Chris Borland Retires Due to Concussion Risk
San Francisco 49ers LB Chris Borland to retire due to safety concerns - Sports Illustrated
49ers Linebacker Quits After 1 Season, Citing Safety Concerns : The Two-Way : NPR
How San Francisco 49ers' Chris Borland made his decision to retire over safety concerns - ESPN