List of NCAA football retired numbers - Wikipedia
Retired number - Wikipedia
Denver Broncos, American Football Wiki
List of National Football League retired numbers - Wikipedia
List of NCAA football retired numbers - Wikipedia
Seattle Seahawks - Wikipedia
Los Angeles Chargers retired numbers - Wikipedia
Has the NFL Ever Retired a Player's Jersey Number League-Wide?
List of NCAA football retired numbers - Wikipedia
List of NCAA football retired numbers - Wikipedia
Arizona Cardinals Team History and Timeline - Sports Illustrated
List of NCAA football retired numbers - Wikipedia
List of NCAA football retired numbers - Wikipedia
List of National Football League retired numbers - Wikipedia
List of Green Bay Packers retired numbers, American Football Database