Why are the New York Yankees retiring Paul O'Neill's number 21 on August 21, 2022? What is your unedited opinion about it? - Quora
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
New York Yankees Retired Numbers: A list of legends who have had their Pinstripes retired over the years
Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx
Appreciating the retired single-digit numbers of the New York Yankees
Yankees want to stop issuing uniform numbers to managers, coaches because they're running out
Zero single-digit numbers in the Bronx? Actually, there's still one left - ESPN
Former Yankees who wore No. 2 share memories of number and Derek Jeter – New York Daily News
Derek Jeter will be final single-digit number retired by Yankees - Newsday
Yankees Mag: The Warrior's Day Cometh
New York Yankees: Retiring numbers, plaque ceremonies must end