Puerto Rican players pushing for MLB to retire Clemente's number
How Roberto Clemente Jr. wants to honor his dad transcends retiring the iconic Pirate's numbers
MLB's First All Latin-American Lineup On Roberto Clemente Day
Retire No. 21 for Roberto Clemente - Our Esquina
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
50 years after Roberto Clemente's death is time of introspection for Puerto Rican baseball
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
Puerto Rican players follow Pirates' push to wear No. 21, celebrate Roberto Clemente
Puerto Rican MLB players can wear number 21 on Clemente Day
Retire 21: Supporters Seek To Honor Baseball Legacy Of Roberto Clemente
Roberto Clemente Day: Pirates and Mets wear 21
Baseball in Clemente's Puerto Rico – a Dream Fulfilled - Pittsburgh Quarterly