Yankees to Retire Pettitte, Posada and Williams Numbers

Yankees to retire Derek Jeter's number in May

Derek Jeter's No. 2 officially retired by Yankees, National Sports

Yankees to Retire Pettitte, Posada and Williams Numbers

Yankees to retire Paul O'Neill's No. 21 jersey this summer - Newsday

Forty-Sixed: a needlessly lengthy look at the Yankees' needlessly extensive history (and future) of retired numbers - Pinstripe Alley

Forty-six shades of pinstripe hypocrisy? A-Rod, PEDs and the Yankee Way

Here are the Yankees' 21 retired numbers Who belongs and who doesn't? Andy Pettitte, Jorge Posada, Bernie Williams, more

A mathematical examination of when the Yankees will run out of numbers to retire

Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired - The New York Times

Andy Pettitte - Wikipedia