The Yankees Retire Paul O'Neill's Number 21 - The New York Times
Yankees Retired Numbers
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Yankees make major request to MLB due to unique problem
The All-Unretired Yankees, Bronx Pinstripes
MLB: The New York Yankees are running out of numbers to issue
The Yankees have retired so many numbers that they're down to just four available for new recruits: 38, 50, 57 and 69. : r/baseball
Yankees next retired number prediction
Yankees Legend Mariano Rivera Becomes First Player Elected To Baseball Hall Of Fame Unanimously - CBS New York