Super Bowl: 49ers' Willis does it his way – Orange County Register
Why would an NFL star retire when he can still play? Patrick Willis explains why he walked away in his prime
Ex-NFL player Patrick Willis: What leaving football for Silicon Valley taught me
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
From His First to Last, Patrick Willis Remembers His 49ers HOF Career
Former Ole Miss star Patrick Willis expected to retire from 49ers
San Francisco 49ers All-Pro LB Patrick Willis expected to retire due to injury, reports say
49ers announce Patrick Willis is retiring - NBC Sports
49ers Linebacker Patrick Willis, 30, Retiring
49ers in flux as Patrick Willis, Justin Smith retire - Sports Illustrated