Paul O'Neill was 'tone-setter in our clubhouse,' former Yankees teammate Joe Girardi says - Newsday
Paul O'Neill's career celebrated with Monument Park plaque, by MLB.com/blogs
Paul O'Neill 'honored' to be 23rd Yankee with number retired
New York Yankees set to retire legendary Paul O'Neill's No. 21
Paul O'Neill's No. 21 to be retired by Yankees
Paul O'Neill on No. 21 retirement Yankees
What Other Numbers Might the Yankees Be Retiring in the Near Future?
Yankees honor Torre
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Paul O'Neill dishes on Yankees (then and now), life in YES booth and being 'blown away' by retired number
Yankees honor Paul O'Neill with Monument Park plaque