Yankees honor Torre
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
New York Yankees history: Paul O'Neill's number 21 must be retired
During Dry Spell, Yankees Emphasize Monument Park - The New York Times
Yankees honor Torre
Yankees retire Paul O'Neill's No. 21 jersey - NBC Sports
Notebook: Monument Park honor 'overwhelming' to Goose Gossage
Yankees honor Paul O'Neill
Jeter's No 2 retired by Yanks; Monument Park plaque unveiled
Yankees honor Paul O'Neill with Monument Park plaque
Paul O'Neill: New York Yankees to retire jersey number
O'Neill honored 21 to join Ruth's 3, Gehrig's 4, Yogi's 8
Photo: New York Yankees honor Paul O'Neill with a plaque in Monument Park - NYP20140809102
Paul O'Neill's number to be retired by Yankees