Patrick Willis retiring from San Francisco 49ers after injury-shortened season – Daily News
5 49ers that deserve stronger Hall of Fame consideration
Patrick Willis is 'no-brainer' Hall of Famer, DeMeco Ryans believes – NBC Sports Bay Area & California
Patrick Willis, JFP Mobile
NFL Legend Patrick Willis to Deliver 2020 Commencement Address - Ole Miss News
5 49ers that deserve stronger Hall of Fame consideration
San Francisco 49ers - Wikipedia
Chris Borland, Fearing for Health, Retires From the 49ers. At 24. - The New York Times
Patriots Tom Brady's longevity? Ex-49ers star mystified
Report: 49ers' Patrick Willis planning to retire
49ers' Patrick Willis isn't in the Hall of Fame and is too busy to care - ESPN - NFL Nation- ESPN
Patrick Willis, American Football Wiki
Patrick Willis of San Francisco 49ers retires - ESPN
Ex-NFL Star Patrick Willis Tackles Storage Technology