Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx
Every MLB team's retired numbers
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Yankees Retired Numbers
ALL OF THE RETIRED NUMBERS IN THE MLB!
Which pro sports teams have the most retired numbers?
What are the Boston Red Sox Retired Numbers?
Retired numbers in Phillies team history Phillies Nation - Your source for Philadelphia Phillies news, opinion, history, rumors, events, and other fun stuff.
All 32 NFL team's retired jersey numbers - ESPN - NFL Nation- ESPN