Another young NFL player calls it quits to protect future health
A look back at the commitment of Chris Borland, Travis Frederick and Michael Deiter to the Wisconsin Badgers
Ex-49er Chris Borland still asked why he quit — and he keeps explaining – East Bay Times
Brain injury proof piles up while Wisconsin football players downplay warnings
Former UW linebacker Chris Borland praises doctor in Time story
NFL players giving up millions and retiring out of nowhere before age 30 is becoming a trend
Chris Borland's retirement won't slow the NFL pipeline – but science could, NFL
Happy for that he was able to make the best decision for him, but such a huge “what could have been” 7 years ago today : r/49ers
Episode 019: Chris Borland – Why He Walked Away From Millions Of Dollars
The Chris Borland Effect: He's Changed His Future, but Did He Change the NFL's?, News, Scores, Highlights, Stats, and Rumors
49ers' Chris Borland, 24, retires because of brain injury concerns - Los Angeles Times
NFL faces no danger from new trend of early retirees
Chris Borland on his early NFL retirement: 'Football could kill you', NFL
49ers hit hard after unexpected offseason departures - The Boston Globe
Chris Borland's Retirement Should Terrify The NFL. Here's Why.