Rays make MLB history with all-Latin lineup on Clemente Day
Campaign To Retire Roberto Clemente's No. 21 Throughout MLB Gains Traction
Report: MLB allowing more players to wear No. 21 on Roberto Clemente Day
Major League Baseball marks Roberto Clemente Day with ceremony at Citi Field - ESPN
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
MLB celebrates Roberto Clemente Day as players wear No. 21, call for number to be retired
Giants coach Nick Ortiz campaigns for universally retiring Clemente's 21
Baseball in Clemente's Puerto Rico – a Dream Fulfilled - Pittsburgh Quarterly
Talkin' 21 Podcast Celebrates Roberto Clemente's legacy - Our Esquina
Best MLB players from Puerto Rico roundtable
No, we do not need to retire Roberto Clemente's number across baseball - NBC Sports
Here's why it would be a bad idea for MLB to retire Roberto Clemente's No. 21