New York Yankees: 5 numbers that need to be un-retired
Yankees Retire Paul O'Neill's No. 21 Jersey, Cashman Booed - Bloomberg
Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
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Yanks lead way with legacy of retired numbers
Yankees Hit 3 Homers to Beat Twins 10-4 for 7th Straight Win - Bloomberg
Giants to retire Will Clark's number - NBC Sports
Uniform number (Major League Baseball) - Wikiwand
Have the Yankees taken retired numbers too far?, Bronx Pinstripes
Yankees retired numbers and the baseball legends who wore them
Why The Cubs Need More Retired Numbers - Bleed Cubbie Blue
Let's go, Oswald! 👊 - New York Yankees