Every MLB team's retired numbers
Mets to Retire Doc Gooden and Darryl Strawberry's Numbers
Blue Jays' All-Time Retired Numbers
Retired Numbers, History
Blue Jays to Retire Number, Wear Patch for Roy Halladay
Mets to retire numbers for Doc Gooden and Darryl Strawberry – NBC
Yankees retire Paul O'Neill's No. 21 jersey
Revisiting Toronto's stance on retired numbers - BlueJaysNation
Philadelphia 76ers Retired Numbers