Yankees to Retire Andy Pettitte, Jorge Posada and Bernie Williams
Yankees to retire Jeter's No. 2, the last single digit
Andy Pettitte, Jorge Posada, Bernie Williams to have numbers
Yankees also retiring numbers for Bernie Williams and Jorge Posada
New York Yankees retired numbers: Is team too generous? - Sports
Here are the Yankees' 21 retired numbers
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired
Yankees to retire O'Neill's No. 21
Reports: Yankees likely to retire Nos. 51 and 20 soon - River
Yankees to retire Nos. of Bernie, Jorge, Pettitte
Derek Jeter's No. 2 retired: See all New York Yankees retired
Yankees also retiring numbers for Bernie Williams and Jorge Posada
New York Yankees: The Numbers on the Wall
Which Phillies numbers should be retired? - The Good Phight
Core Four - Wikipedia