Retired Uniform Numbers in the American League
List of Major League Baseball retired numbers - Wikipedia
Yankees' All-Time Retired Numbers
Biography - Yogi Berra Museum & Learning Center
Baseball to Retire Deutsch's Number on Alumni Appreciation Day - Montclair State University Athletics
Berra, Yogi Baseball Hall of Fame
The case for retiring Graig Nettles' number - Pinstripe Alley
Retired Uniform Numbers in the American League
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired - The New York Times