NFL player retires after one season citing concussion concerns
Chris Borland says NFL rookies told to 'get a fall guy'
Analysis of Greg Hardy's Cowboys contract, Chris Borland retirement - Sports Illustrated
49ers LB Chris Borland won't be last to retire early for safety reasons - Sports Illustrated
San Francisco 49ers: Who Will Replace Patrick Willis and Chris Borland?, News, Scores, Highlights, Stats, and Rumors
Chris Borland retires from NFL at just 24 years old, makes his own sense of head injuries – New York Daily News
Chris Borland says he'll repay 49ers most of signing bonus
San Francisco 49ers LB Chris Borland to retire due to safety concerns - Sports Illustrated
NFL Brain Injury: 49ers Anthony Davis won't play in 2015 - Sports Illustrated
Chris Borland says he is paying back 3/4 of his signing bonus - Niners Nation
Seahawks sue former draft pick Malik McDowell for failing to repay bonus money
49ers' Chris Borland, 24, retires because of brain injury concerns - Los Angeles Times
Nonsense; Chris Borland's retirement isn't going to change the NFL