New York Yankees retired numbers: Is team too generous? - Sports Illustrated
Yanks to retire numbers for Williams, Pettitte, Posada
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
List of Yankee Retired Numbers in Monument Park - Newsday
The case for retiring Graig Nettles' number - Pinstripe Alley
Zero single-digit numbers in the Bronx? Actually, there's still one left - ESPN
New York Yankees Retired Numbers: A list of legends who have had their Pinstripes retired over the years
Spring Training: There's safety in numbers