List of Major League Baseball retired numbers - Wikipedia
Something New To Be Looking For On MLB's Opening Day; Debut Patch
Que Viva Clemente! Roberto Lives On in the Hearts of Latino Major Leaguers – Society for American Baseball Research
McCutchen 1st Hit Of MLB Season, As NL DH, With No. 21 Patch
Yogi Berra – mlbblogger
Roberto Clemente Day celebrated around MLB in 2023
MLB honors Roberto Clemente during Hispanic Heritage Month
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago
Roberto Clemente's Year in the Dodgers Organization – Society for American Baseball Research
Sports Cards: The Most Iconic MLB Rookie Card for Every Team, News, Scores, Highlights, Stats, and Rumors
Texas Rangers on X: Incredibly proud to honor @thearn14 as our Roberto Clemente Award nominee! Vote Taylor: / X
Blue Jays retire Roy Halladay's No. 32 before Opening Day game vs. Yankees – New York Daily News