Yankees are running out of single-digit numbers | MLB.com
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired - The New York Times
MLB celebrates Roberto Clemente Day as players wear No. 21, call for number to be retired - CBSSports.com
Zero single-digit numbers in the Bronx? Actually, there's still one left
Jeter's retirement marks end of Yanks' single-digit numbers
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired
Rich tradition of retired numbers part of game's legacy | MLB.com
One Through Nine Are Loneliest Numbers For Pitchers in Majors - WSJ
Every uniform number ever, ranked by value
Uniform number (Major League Baseball) - Wikipedia
1 Legend from Every MLB Team Who Deserves to Have Their Number Retired | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
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Who were the first and last Yankees players to wear the retired numbers? - Pinstripe Alley
MLB Jersey Numbers on Twitter: "As the @Yankees announce the retirement of Derek Jeter's number, they remain leaps and bounds above the rest of the league in the category. https://t.co/o0Srt1QQdz" / Twitter
How players are using uniform numbers to break MLB's unwritten rules
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Single-Digit Jerseys Should Be the NFL's Most Exclusive Club - The Ringer
Six Baseball Stars Get Singular Honor As Teams Will Retire Their Jerseys
List of Major League Baseball retired numbers - Wikipedia
MLB jersey numbers likely to be retired next
Future MLB jersey numbers likely to be retired
MLB Jersey Numbers: the 80s — A Foot In The Box
Yankees next retired number prediction
Every MLB team's retired numbers
