Yankees retire Jorge Posada's No. 20 in Monument Park
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
Jorge Posada honored at Yankee Stadium
Yankees Will Retire Numbers for Jorge Posada, Bernie Williams, Andy Pettitte - WSJ
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Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
Yankees retire Posada's No. 20 in Monument Park
During Dry Spell, Yankees Emphasize Monument Park - The New York Times
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired - The New York Times
