As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
Yankees retire Paul O'Neill's No. 21 jersey - NBC Sports
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
New York Yankees history: Paul O'Neill's number 21 must be retired
Paul O'Neill (baseball) - Wikipedia
Hal Steinbrenner is more understated than his father, but Yankees' status is still a priority - Newsday
Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
NY Yankee Paul O'Neill's No. 21 to be retired on Aug. 21
Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday
Paul O'Neill returning to YES Network broadcast booth for Yankees games
New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
A conversation with Hal Steinbrenner - Newsday
Paul O'Neill was 'tone-setter in our clubhouse,' former Yankees teammate Joe Girardi says - Newsday
Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday