Report: 49ers expected to sign LB Malcolm Smith
Chris Borland retirement - Outside the Lines (March 17, 2015)
49ers' Chris Borland, 24, quits NFL over concussion worries
San Francisco 49ers Chris Borland retires over repeated head trauma
Chris Borland retirement - Outside the Lines (March 17, 2015)
Chris Borland retirement - Outside the Lines (March 17, 2015)
Since retiring from football, Chris Borland fills void with advocacy - ESPN - San Francisco 49ers Blog- ESPN
San Francisco 49ers Chris Borland retires over repeated head trauma
San Francisco 49ers Chris Borland retires over repeated head trauma
Chris Borland retires from 49ers after one year due to fears over head trauma, NFL
49ers LB Chris Borland won't be last to retire early for safety reasons - Sports Illustrated
San Francisco 49ers LB Chris Borland to retire due to safety concerns - Sports Illustrated
Chris Borland says NFL rookies told to 'get a fall guy'
How former San Francisco 49ers Chris Borland's retirement could change NFL forever - ESPN