Yankees' Core Four answer the postseason bell
The Cour Four: Yankee legends have roundtable lunch discussion - Sports Illustrated Vault
After Six Years, Center Stage Again - The New York Times
Core Four: Most Up-to-Date Encyclopedia, News & Reviews
Ny Yankees: Jeter, Rivera, Pettitte, And Posada Signed Oversized Photograph
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ANdy Pettitte, Mariano Rivera, Jorge Posada and Derek Jeter 5 time world series champions the core four New York Yankees shirt, hoodie, sweater, long sleeve and tank top
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Fab Five reunite as Yankees retire Bernie Williams' No. 51
Brian Cashman, Mariano Rivera and others pay tribute to Derek Jeter - Newsday
Core Four - Wikipedia
Unanimous Hall of Famer and Core Four Member, Mariano Rivera, Engages in Rapid Fire, Leaves Out Derek Jeter - EssentiallySports