NY Yankees retire Paul O'Neill's No. 21
Paul O'Neill Deserves It But Isn't It Getting A Bit Ridiculous
1998 Yankees Diary, May 31: Bombers settle for split with Rival Red Sox - Pinstripe Alley
Paul O'Neill still gets fired up thinking about 1996 and the Yankees' dynasty years – New York Daily News
Is Paul O'Neill in the Baseball Hall of Fame? - Quora
1999: Stand clear of the closing doors - Amazin' Avenue
Paul O'Neill will finally have number retired by Yankees
Yankees honor Tino Martinez with Monument Park plaque
Paul O'Neill on No. 21 retirement Yankees