Why every MLB player is wearing No. 42 today
As cases for Roy Halladay and Dick Allen point out, baseball's retired numbers are multiplying
The Yankees Retire Paul O'Neill's Number 21 - The New York Times
MLB retired numbers include 10 for state players
New York Yankees retired Paul O'Neill's No. 21 jersey
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Yankees make special request to MLB with franchise's 22 retired numbers causing logistical issue, per report
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them