Jorge Posada says he won't return to Yankees
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Some Perspective on Yankee Openers in the Derek Jeter Era - Pinstripe Alley
Core Four - Wikipedia
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Posada seen likely to return to action this season - ESPN
New York Yankees: The 5 greatest catchers in franchise history
Moving on from the Derek Jeter Era - Pinstripe Alley
Jorge Posada saluted by former Yankees manager Joe Torre, pitcher David Cone
Jorge Posada falls off Hall of Fame ballot after just one year
With Jeter's retirement, Yankees will say goodbye to 'Core Four' era
Jorge Posada officially retires on this day in 2012, Nine years ago today, Jorge Posada officially announced his retirement after 17 seasons with the New York Yankees., By YES Network
Yankees fans make statement booing Hal Steinbrenner while soaking in Paul O'Neill Day
Yankees Mag: Meant to Be
Yankees' Eric Chavez may seize DH spot with Jorge Posada benched
Derek Jeter is the Yankee you can't hate - The Boston Globe
Yankees honour ex-captain Derek Jeter on Hall of Fame induction