Yankees retired numbers: A look at all of the jersey numbers players cannot wear in the Bronx
The unique Twins uniform numbers and the players who have worn them - Twinkie Town
Yankees: Who Will Be The Next Player To Get Their Number Retired? - Unhinged New York
Uniform number (Major League Baseball) - Wikipedia
History of retired numbers dates back to Lou Gehrig Day
A pitcher wearing number 1? It's happened before – Washington baseball history
HALLOWED GROUND: Monument Park, New York Yankees Museum honor greatest players from most legendary team in sports - Sports Collectors Digest
Paul O'Neill Number Retirement Raises Debate - Last Word On Baseball
MLB retired numbers include 10 for state players
On Uniform No. 0, the Yankees Rule Out Nothing - The New York Times
Yankees make major request to MLB due to unique problem
Yankees retired numbers and the baseball legends who wore them
Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
What the Yankees' uniform number crunch could cost MLB's managers and coaches - The Athletic
Yankees retired numbers