The Yankees Retire Paul O'Neill's Number 21 - The New York Times
During the Yankees' 4 World Series championships from 1996 to 2000, the player with the greatest WAR on the team was not a member of the Core Four, but actually Bernie Williams.
Paul O'Neill remembered as one of great Yankees
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Paul O'Neill's top 7 New York Yankees moments
Top moments from O'Neill's time as a Yankee
Paul O'Neill (baseball) - Wikipedia
New York Yankees, History & Notable Players
8,700 New York Yankees 8 4 Stock Photos, High-Res Pictures, and Images - Getty Images
Baseball MLB 2000 Fleer Metal #196 Paul O'Neill EX+ Yankees : Collectibles & Fine Art