Nats DH Cruz, other Clemente Award winners wear '21' on caps
Wearing Roberto Clemente's No. 21 an honor for Francisco Lindor, Sandy Alomar Jr. and all Puerto Rican-born Cleveland Indians
Pirates Celebrate Roberto Clemente Day, WESB B107.5-FM/1490-AM
Cubs Players on the Importance of Roberto Clemente Day
Members of Red Sox wear No. 21 with pride on Roberto Clemente Day - The Boston Globe
Carlos Delgado says MLB should retire Roberto Clemente's No. 21
21 things you should know on Roberto Clemente Day
21 things you should know on Roberto Clemente Day
Outside The Confines: Everyone wore 21 - Bleed Cubbie Blue
Roberto Clemente - Wikipedia
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
21 things you should know on Roberto Clemente Day
Building Nations of Good - Roberto Clemente Foundation