Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
All Yankees retired numbers: The Bronx Bombers
MLB: The New York Yankees are running out of numbers to issue
List of Yankee Retired Numbers in Monument Park - Newsday
Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx
Yankees' Mariano Rivera Is the Last No. 42 - The New York Times
Yankees retired numbers and the baseball legends who wore them
Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers
Mets to retire Gooden's No. 16 and Strawberry's No. 18 next season
New York Yankees - Wikipedia
The Yankees Retire Paul O'Neill's Number 21 - The New York Times