Where the Giants stand with Buster Posey, Joey Bart as they shift focus toward 2021 – Daily Democrat
Buster Posey opts out of 2020 MLB season: Giants star catcher concerned about health of adopted twin baby girls
Hail to the Buster Together We're Giants
Buster Posey opts out of 2020 MLB season - Sports Illustrated
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
SF Giants' Posey opts out, citing twins' health as reason, Sports
Giants' Buster Posey honored by MLB players for comeback season – NBC Sports Bay Area & California
Buster Posey explains why he retired after celebrated career with Giants
AP Source: Giants C Buster Posey will announce retirement - Seattle Sports
Buster Posey opts out of 2020 season - Lone Star Ball