49ers' loss of Patrick Willis a jarring one – The Mercury News
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Patrick Willis retiring from 49ers after injury-shortened season, NFL
Bleacher Report - San Francisco 49ers make it official: Patrick Willis will retire. Details
Patrick Willis retiring from 49ers after injury-shortened season, NFL
Patrick Willis of San Francisco 49ers retires - ESPN
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Patrick Willis Explains Decision to Retire from NFL
Patrick Willis Explains Decision to Retire from NFL
Should a short career dim the Hall of Fame chances of Patrick Willis? : r/nfl
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News