Paul O'Neill's career celebrated with Monument Park plaque, by MLB.com/blogs
Yankees honor Paul O'Neill with Monument Park plaque
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Notebook: Monument Park honor 'overwhelming' to Goose Gossage
Uncle Mike's Musings: A Yankees Blog and More: Who Belongs in Monument Park?
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
Yankees honor Paul O'Neill with Monument Park plaque
Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers
Yankees retire Torre's No. 6 Chattanooga Times Free Press
Yankees fans boo Hal Steinbrenner during Paul O'Neill ceremony
Yankees honor Paul O'Neill with Monument Park plaque