Yankees' Jorge Posada gets number retired, plaque in Monument Park
September 21, 2008: The final game at Yankee Stadium – Society for American Baseball Research
Yankees Will Retire Numbers for Jorge Posada, Bernie Williams, Andy Pettitte - WSJ
Jorge Posada honored by Yankees with Monument Park plaque, has number retired - Newsday
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Sunday Gravy: Yankees would rather retire No. 13
Jeter's Number 2 Retired, Yankees Now Out of Single Digit Jerseys, WNYC News
Yankees retire Andy Pettitte's number, give him plaque in Monument Park
Derek Jeter's No. 2 retired by Yankees; Monument Park plaque unveiled – The Denver Post
The Athletic] The Yankees have asked MLB if they can stop issuing uniform numbers to their manager and coaches because they're running out of numbers that aren't retired : r/baseball
Yankees also retiring numbers for Bernie Williams and Jorge Posada
