File:Target Field retired numbers.JPG - Wikipedia
History of retired numbers dates back to Lou Gehrig Day
MLB Retired Numbers: An Overview
History of Celtics retired numbers - CelticsBlog
Giants Ring of Honor, Giants History
File:New Jersey Devils' Retired Numbers.jpg - Wikipedia
File:49ers retired numbers at Candlestick Park 2010-08.JPG
Retired Uniform Numbers in the American League
File:Giants Retired Numbers.jpg - Wikimedia Commons
Celtics' bland retired number banners are unworthy of the
File:Miller Park Retired Numbers (4952579861).jpg - Wikimedia Commons
Retired number new feature? : r/OOTP