List of Major League Baseball retired numbers - Wikipedia
Retired Uniform Numbers in the American League
How many NBA players have numbers retired by multiple teams? Is Pau Gasol next? – NBC Sports Chicago
Will Lakers retire both of LeBron James' jersey numbers when he hangs it up? - Los Angeles Times
Every MLB team's retired numbers – NBC Sports Chicago
Every NBA Team's Retired Numbers - Fadeaway World
Nuggets Ought to Retire Carmelo Anthony Uniform When Jokic Finishes
Why every MLB player is wearing No. 42 today
Jackie Robinson Day, when MLB players can wear No. 42
LeBron James will join this list of NBA players with numbers retired by multiple teams – NBC Los Angeles
Denver Broncos to unveil retired number signage on Sunday - Mile High Report