Yankees also retiring numbers for Bernie Williams and Jorge Posada
New York Yankees: The Numbers on the Wall
New York Yankees to retire Paul O'Neill's number
Yankees 'likely' to retire Bernie Williams, Jorge Posada numbers
Monument Park at Yankee Stadium - Attractions - Baseball Life
Jeter returns as Yankees honor 1998 team at Old-Timers' Day, Boone booed by some – NewsNation
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed – KXAN Austin
New York Yankees to retire Paul O'Neill's No. 21 on Aug. 21
Jorge Posada, Baseball Wiki