Roberto Clemente's No. 21 is 'retired in our hearts' but not on most MLB rosters - The Athletic
For the 'Great One'; Pirates, MLB honor Roberto Clemente
Roberto Clemente, Biography, Stats, & Facts
It's time for Roberto Clemente's No. 21 to be retired across baseball - Bucs Dugout
Roberto Clemente: Baseball Rebel – Society for American Baseball Research
All-Star Game Ceremony Recognizing Roberto Clemente Should Have Included Ultimate Honor
Google Honors Late Pirates Great Roberto Clemente
Remembering the legacy of Roberto Clemente and a lasting impact beyond 3,000 hits
Pittsburgh Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente
Pirates honor 'The Great One' on Roberto Clemente Day (Video)
It's time for Roberto Clemente's No. 21 to be retired across baseball - Bucs Dugout
All-Star closer David Bednar named Pirates nominee for Roberto Clemente Award