Yankees fans boo Hal Steinbrenner during Paul O'Neill ceremony
Uncle Mike's Musings: A Yankees Blog and More: How to Go to a Yankee Game -- 2016 Edition
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Yankees, YES will try to salvage awkwardness of Paul O'Neill Day
Bernie Williams
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Paul O'Neill (baseball) - Wikipedia
Paul O'Neill takes in 'biggest dream' of his life as Yankees retire No. 21