Paul O'Neill's No. 21 to Be Retired By Yankees – NBC New York
Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers
New York Yankees - Wikipedia
Jackie Robinson Day - Wikipedia
The Blue Jays will retire Roberto Alomar's number - NBC Sports
Yankees retire Mariano Rivera's number
Aaron Judge Becomes Yanks Captain, With Derek Jeter At Side
Tim Wakefield, Red Sox knuckleball pitcher and World Series champ, dies at 57
Chuck Knoblauch is apparently irked at Andy Pettitte getting his number retired - NBC Sports
Jeter returns as Yankees honor 1998 team at Old-Timers' Day, Boone booed by some
The Yankees have a lot of retired numbers. Other teams should try to be more like them. - NBC Sports
Yankees' All-Time Retired Numbers