Twins' all-time retired numbers
History By The Numbers (FLCeltsFan) - CelticsBlog
File:NYI Retired Number.JPG - Wikipedia
Have the Yankees taken retired numbers too far?, Bronx Pinstripes
LOOK: Retired jersey numbers in Lakers history
Out of the Park Developments Online Manuals
Retired Uniform Numbers in the American League
Celtics' bland retired number banners are unworthy of the franchise's history
File:Miller Park Retired Numbers (4953172314).jpg - Wikimedia Commons
MLB Retired Numbers: An Overview
File:Giants Retired Numbers.jpg - Wikimedia Commons