New York Yankees retired Paul O'Neill's No. 21 jersey
Jorge Posada honored by Yankees with Monument Park plaque, has number retired - Newsday
Bleeding Yankee Blue: POSADA, RETIRING #20 & ME
Yankees retire Jorge Posada's No. 20 in Monument Park
Yankees to Retire Andy Pettitte, Jorge Posada and Bernie Williams' Jersey Numbers
Jorge Posada debuts on Hall of Fame ballot
Jorge Posada on deck for his first Yankees Old-Timer's Day
Yankees to retire numbers of Posada and Bernie, too
Jorge Posada - Wikipedia