Yankees retired numbers and the baseball legends who wore them
A number of nuggets about retired numbers around the Major League
NY Yankee Paul O'Neill's No. 21 to be retired on Aug. 21
Best Yankees players by uniform number
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Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
List of New York Yankees captains - Wikipedia
What the Yankees' uniform number crunch could cost MLB's managers and coaches - The Athletic
The Cubs should retire several more jersey numbers - Bleed Cubbie Blue
The unique Twins uniform numbers and the players who have worn them - Twinkie Town
Yankees retired numbers
The Yankees have a lot of retired numbers. Other teams should try to be more like them. - NBC Sports
Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx
Why every MLB player is wearing No. 42 today
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Uniform number (Major League Baseball) - Wikipedia
The Worst Players to Wear Each of the 21 Retired Yankees Numbers - Sports Pickle