Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente - The San Diego Union-Tribune
MLB allows Puerto Rican players to wear No. 21 on Roberto Clemente Day - ESPN
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
Ríos, Hernández to wear uniform No. 21 on Roberto Clemente Day, by Rowan Kavner
For the 'Great One'; Pirates, MLB honor Roberto Clemente
All Puerto Rican players can wear 21 on Roberto Clemente Day
Pirates would again like to wear No. 21 in 2021
Roberto Clemente Day celebrated around MLB in 2023
Tonight was a monumental night:' Pirates, Josh Bell honor Clemente family during Roberto's day
21 Facts You May Not Know About Roberto Clemente on the Anniversary of His Debut, News, Scores, Highlights, Stats, and Rumors
Angels' José Molina does his best to honor Roberto Clemente - Los Angeles Times
Sources: MLB letting more players to wear No. 21 for Clemente Day
Pirates honor 'The Great One' on Roberto Clemente Day (Video)
Pirates to wear No. 21 on Roberto Clemente Day
Roberto Clemente Day to Be Held Throughout MLB on Thursday – NBC Bay Area