Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks
Appreciating the retired single-digit numbers of the New York Yankees
No. 1's Son: Billy Martin, Jr. - BallNine
Billy Martin Retired Number 1 Patch 3" Round New York Yankees Pinstripes
Yankees' controversial, colorful Billy Martin died 25 years ago in Christmas accident
Yankee Stadium: Monument Park - Retired Numbers - Billy Martin #1
Derek Jeter's No. 2, Last of Yankees' Single Digits, to Be Retired - The New York Times
The Athletic] The Yankees have asked MLB if they can stop issuing uniform numbers to their manager and coaches because they're running out of numbers that aren't retired : r/baseball
Remembering 16 Yankees who died in 2020, including Whitey Ford, Phil Niekro, Don Larsen, Horace Clarke
Billy Martin - 1954 - #1 - - Database of Yankee Uniform Numbers Through the Years
With Derek Jeter's number retired, Yankees shouldn't be retiring anymore for a while – New York Daily News
Ralph Terry, Yankee Hurler Redeemed by One Pitch, Dies at 86 - The New York Times
Yankees' All-Time Retired Numbers
Yankee Retired Numbers: The All-Time Numerical Lineup of Yanks