49ers' Patrick Willis retires after injury-shortened season - The San Diego Union-Tribune
49ers LB Patrick Willis to retire - ABC13 Houston
49ers' Patrick Willis retires 'happy' – The Mercury News
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers' Patrick Willis retires 'happy' – The Mercury News
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
Bruceton native Patrick Willis retiring after injury-shortened season - WBBJ TV
49ers LB Willis retiring after toe surgery
Patrick Willis Explains Decision to Retire from NFL
Graham, Bradford trades upstage signings
San Francisco 49ers - Wikipedia