Chris Borland's Early NFL Exit Doesn't Mean Avoiding Brain Damage, Experts Say - ABC News
On Andre Waters and Chris Borland
Former Badgers star Borland surprisingly announces retirement
49ers star Borland, 24, retires over health concerns
Retiring 49er Chris Borland to pay back NFL signing bonus - Sports Illustrated
San Francisco 49ers on X: In third NFL start, #49ers LB Chris Borland recorded 17 tackles and recovered a fumble. READ: / X
Five Fun Facts About Chris Borland - Fangirl Sports Network
49ers' Chris Borland Retires From NFL Over Safety Concerns
How Afraid Should the NFL be of Chris Borland?
49ers' Chris Borland retires: NFL responds, cites safety progress - Los Angeles Times
NFL: Chris Borland retiring at 24, wary of head trauma