New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
Yankees fans boo Hal Steinbrenner during Paul O'Neill ceremony
Paul O'Neill's Number Getting Retired: MLB World Reacts - The Spun: What's Trending In The Sports World Today
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Derek Jeter drops message for Paul O'Neill after Yankees retire his number
Yankees Stadium Hijacked by Boos as Infuriated Fans Proclaim Frustration During Jersey Retirement Ceremony for Shocking Pinstripes Slump - EssentiallySports
New York Yankees history: Paul O'Neill's number 21 must be retired
Yankees' retirement of Paul O'Neill's number might be a stretch - Pinstripe Alley
All-Star Paul O'Neill's No. 21 jersey to retire on Aug. 21
New York Yankees to retire Paul O'Neill's jersey number during 2022 season - Sports Illustrated NY Yankees News, Analysis and More
Monument Park (Yankee Stadium) - Wikipedia