San Francisco 49ers - Wikipedia
Patrick Willis: 49ers rift with Jim Harbaugh didn't cause retirement
Did NFL legend Patrick Willis just hint at a comeback?
Patrick Willis' retirement a jarring one for 49ers – Times Herald Online
10 Things Fans Should Know about Patrick Willis
49ers roster, 90-in-90 breakdowns: Patrick Willis - Niners Nation
49ers in flux as Patrick Willis, Justin Smith retire - Sports Illustrated
Patrick Willis Says Change 'Must' Happen After 49ers Loss
Bears linebacker Roquan Smith won't beg for your Pro Bowl votes - Chicago Sun-Times
Patrick Willis' Shock Retirement Marks Official End of Jim Harbaugh-Era 49ers, News, Scores, Highlights, Stats, and Rumors
Linebacker Patrick Willis is ready to retire, even though he's only 30 – The Denver Post
Patrick Willis' 49ers ready for Ray Lewis' Ravens – The Mercury News
Patrick Willis Explains Decision to Retire from NFL
San Francisco 49ers: Who Will Replace Patrick Willis and Chris Borland?, News, Scores, Highlights, Stats, and Rumors