Here are the Yankees' 21 retired numbers

Retired number new feature? : r/OOTP

New York Yankees retired Paul O'Neill's No. 21 jersey

Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx

Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks

NY Yankees royalty honored as Paul O'Neill's No. 21 is retired

New York Yankees retired numbers: Is team too generous? - Sports Illustrated

Yankee Stadium's Final Game (9/21/08), On this day in 2008, the Yankees played their final game at the original Yankee Stadium., By New York Yankees Highlights

Numbers the Red Sox Should Consider Retiring - Over the Monster

Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed – WATE 6 On Your Side