Paul O'Neill's No. 21 to be retired by Yankees
Yankees fans boo Hal Steinbrenner during Paul O'Neill ceremony
Uncle Mike's Musings: A Yankees Blog and More: November 5, 1869: The Cincinnati Red Stockings
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
In celebration of Paul O'Neill Day, 21 Yankees GIFs to remember #21 - Pinstripe Alley
Paul O'Neill's No. 21 to be retired by Yankees
Paul O'Neill's No. 21 to be retired by Yankees
How surprising was it when the 2003 Marlins beat the Yankees in the World Series? - Quora
In celebration of Paul O'Neill Day, 21 Yankees GIFs to remember #21 - Pinstripe Alley
New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
NY Yankees retire Paul O'Neill's No. 21
Happy Paul O'Neill Day! Here are 10 of his greatest moments as a New York Yankee
Paul O'Neill takes in 'biggest dream' of his life as Yankees retire No. 21