Yankee Stadium (1923) - Wikipedia
MLB: The New York Yankees are running out of numbers to issue
Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more
Honoring Piazza? Paying Cespedes? Meet the Suddenly Generous Mets - The New York Times
Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx
Yankee Stadium - Wikipedia
Yankees retired numbers and the baseball legends who wore them
New York Yankees - Wikipedia
New York Yankees ceremony addiction is getting out of hand
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
What should the Yankees do once they run out of numbers? - Pinstripe Alley
The second-best Yankee to wear each retired number - Part One - Pinstripe Alley
A number of nuggets about retired numbers around the Major League
All Yankees retired numbers: The Bronx Bombers