New York Yankees retired numbers: Is team too generous? - Sports Illustrated
List of retired numbers in association football - Wikipedia
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers - The New York Times
Kobe Retiring Both Numbers Is So Very Kobe - The Ringer
Every MLB team's retired numbers
Southern California teams' retired numbers – Orange County Register
Lakers News: First Great Lakers Center Will Have Jersey Posthumously Retired - All Lakers
Why Do Numbers Get Retired in Sports?
Why don't the Mets retire more jersey numbers? – Mets360
Which jersey numbers have the Utah Jazz retired? - Deseret News
The next likely jersey retirement for every NFL team
When every baseball team will run out of uniform numbers - All My Sports Teams Suck
Every NBA Team's Retired Numbers - Fadeaway World
History of retired numbers dates back to Lou Gehrig Day