AP Source: Giants C Buster Posey will announce retirement
Giants legend Buster Posey officially retires, cites family, other reasons
After adopting twin girls, Buster Posey elects not to play in 2020 MLB season, Archives
Buster Posey opts out of 2020 MLB season, Rodriguez, Thomas & Rosenthal react to decision
Buster Posey announces adoption of twin girls, opts out of shortened 2020 season – SFBay
San Francisco Giants' Buster Posey Opts out of 2020 Season Due to Health Concerns for Adopted Twins Adopting
Kawakami: He's opting out of 2020, but Buster Posey has never been more valuable - The Athletic
SF Giants' Buster Posey details emotional decision to retire: 'I went into this last season feeling like it might be my last' – Times Herald Online
Giants' Buster Posey elects not to play in 2020