List of National Football League retired numbers - Wikipedia
Infographic: Packers' retired numbers
All-time list of retired numbers in the NBA
App State to Retire Armanti Edwards' Number 14 - App State Athletics
List of National Football League retired numbers - Wikipedia
Cities With the Most Professional Sports Franchises
List of retired numbers in association football - Wikipedia
2010-11 Limited Retired Numbers Silver Spotlight #16 Henri Richard/49
Retired number - Wikipedia
MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago
Top Professional Sports Leagues by Revenue
A number of nuggets about retired numbers around the Major League
NBA Teams With the Most Retired Numbers
Why Kobe Bryant changed jersey numbers and what No. 8 and No. 24 meant to the NBA legend
How Many Jersey Numbers have been Retired in the NFL?