Patrick Willis Injury: 49ers lose linebacker for season - Big Blue View
49ers training camp: After NaVorro Bowman injury, Patrick Willis at helm of banged-up defense - Sports Illustrated
San Francisco 49ers All-Pro LB Patrick Willis expected to retire due to injury, reports say
San Francisco 49ers: Who Will Replace Patrick Willis and Chris Borland?, News, Scores, Highlights, Stats, and Rumors
Sources: Patrick Willis to have season-ending surgery
Patrick Willis injury: What does a slightly fractured hand mean for the 49ers? - Niners Nation
49ers' Patrick Willis retires 'happy' – The Mercury News
Patrick Willis, Tramaine Brock injuries: Considering medical implications of turf toe - Niners Nation
49ers linebacker Patrick Willis plays despite broken hand – The Mercury News
Ready for His Ring: Patrick Willis Fueled by Void
Patrick Willis Explains Decision to Retire from NFL
49ers' Patrick Willis retires after injury-shortened season – The Mercury
Ready for His Ring: Patrick Willis Fueled by Void
Patrick Willis - Wikipedia