Chris Borland retirement from 49ers shows shift in attitude - Sports Illustrated
Why early NFL player retirements actually make sense
San Francisco linebacker Patrick Willis announces his retirement - The Globe and Mail
NaVorro Bowman stops by 49ers facility, tells team he's retiring as a 49er
The 5 Biggest Threats in the NFC West - Part 7 - Patrick Willis - Turf Show Times
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers' Patrick Willis retires after injury-shortened season
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers' Patrick Willis retires 'happy' – The Mercury News
Linebacker Patrick Willis Retires - The Source
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
San Francisco 49ers: Predicting Hall of Fame Chances for Patrick Willis, News, Scores, Highlights, Stats, and Rumors
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News