Photo: New York Yankees honor Paul O'Neill with a plaque in Monument Park - NYP20140809102
Paul O'Neill on No. 21 retirement Yankees
Tino Martinez is getting a plaque in Monument Park for some reason - NBC Sports
Paul O'Neill Yankees No. 21 retired
Tino turned out to be a legend, too
Paul O'Neill discusses number retirement by Yankees
Why wasn't Monument Park already a Yankees team Hall of Fame? - Pinstripe Alley
Yankees to honor Mariano Rivera with a plaque in Monument Park on August 14. : r/baseball
Yankees retire Paul O'Neill's No. 21 jersey
Yankees] 8.21.22 Paul O'Neill's No. 21 enters Monument Park. : r/NYYankees
Paul O'Neill 'honored' to be 23rd Yankee with number retired
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
Paul O'Neill and the trade that changed everything - Pinstripe Alley
Expanding Monument Park: What Marketers Can Learn From the Yankees
Torre has number retired, plaque in Monument Park