Yanks to retire numbers for Williams, Pettitte, Posada

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

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

Yankees to retire numbers of Posada and Bernie, too

Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers

Williams has No. 51 retired at Yankee Stadium

Jason Giambi retires, Yankees will honor Andy Pettitte, Jorge Posada and Bernie Williams and more MLB news

Yankees also retiring numbers for Bernie Williams, Jorge Posada; Willie Randolph to be honored in Monument Park - NBC Sports