Power of Derek Jeter's No. 2 - MLB's most productive jersey numbers
What the Yankees' uniform number crunch could cost MLB's managers and coaches - The Athletic
New York Yankees to retire Paul O'Neill's No. 21 on Aug. 21
As cases for Roy Halladay and Dick Allen point out, baseball's retired numbers are multiplying
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Number 21 Continues to Remain Sacred to the New York Yankees, News, Scores, Highlights, Stats, and Rumors
A number of nuggets about retired numbers around the Major League
How many jersey numbers do the Yankees have left? - Deseret News
Yankees retired numbers and the baseball legends who wore them
What the Yankees' uniform number crunch could cost MLB's managers and coaches - The Athletic
Paul O'Neill: New York Yankees to retire jersey number
Uniform numbers for Yankees coaches, managers could soon be thing of the past due to numbers shortage