Paul O'Neill Yankees No. 21 retired
Retired Numbers editorial image. Image of curve, hall - 93364235
List of Yankee Retired Numbers in Monument Park - Newsday
Legends honored at Yankees' Monument Park
Remembering Yankee Stadium
Yankee Stadium - Monument Park - Babe Ruth Monument
Monumental Decision: The Boss to Take Rightful Place in Monument Park; Yankees' Tradition of Honoring Greats in Granite Continues
Monument Park (Yankee Stadium) - Wikipedia
September 21, 2008: The final game at Yankee Stadium – Society for American Baseball Research
Derek Jeter Set to Take His Place in Monument Park. But Where Exactly? - The New York Times
Rivera, Halladay, Martinez, Mussina Elected To Baseball's Hall Of Fame : NPR
HALLOWED GROUND: Monument Park, New York Yankees Museum honor greatest players from most legendary team in sports - Sports Collectors Digest