As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
Seven Days, March 22, 2023 by Seven Days - Issuu
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Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
What other unused uniform numbers should the Yankees give out? - Pinstripe Alley
Will You Try Nude Pickleball Yakima? Your Clothing is Optional
New York Yankees history: Paul O'Neill's number 21 must be retired
A number of nuggets about retired numbers around the Major League
Calaméo - MAR282019
Boca magazine November/December 2022 by JES Media - Issuu
Who were the first and last Yankees players to wear the retired numbers? - Pinstripe Alley
Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
Best Yankees players by uniform number