Fightins to Retire Roberto Clemente's #21 - BCTV
Baseball's last hero': Roberto Clemente's humanitarian efforts rivaled his MLB success
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
Yankees reliever from Anchor Bay hit in head with line drive during game against Pittsburgh – Macomb Daily
Bill Mazeroski – Society for American Baseball Research
Major League Baseball Season Recap 1957 - This Day In Baseball
Sandy Koufax - Wikipedia
Many want #21 retired in MLB - ESPN - OneNacion Blog- ESPN
Pittsburgh Pirates Roberto Clemente number 21 should be retired - ESPN - OneNacion Blog- ESPN
MLB celebrates Roberto Clemente Day
Campaign To Retire Roberto Clemente's No. 21 Throughout MLB Gains Traction
Campaign To Retire Roberto Clemente's No. 21 Throughout MLB Gains Traction