The Yankees have a lot of retired numbers. Other teams should try

Top Five NY Numbers to Be Retired With Joe B., Plus Yankees Take Two - The Ringer

New York Yankees jersey number shortage - Sports Illustrated

How many jersey numbers do the Yankees have left? - Deseret News

Southern California teams' retired numbers – Orange County Register

Yankees Retired Numbers

NBA jersey retirements: Kobe's two numbers, Jordan's jersey in Miami without playing and other curiosities

The All-Unretired Yankees, Bronx Pinstripes

Yankees Want to Stop Giving Numbers to Coaches - Fastball

Retired number - Wikipedia