Rays Star Calls Wearing No. 21 on Roberto Clemente Day 'An Honor
Roberto Clemente day: Puerto Rican MLB players, Pirates wear No. 21
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
Pirates to wear No. 21 on Sept. 9 to honor Roberto Clemente - NBC Sports
Roberto Clemente's No. 21 is 'retired in our hearts' but not on most MLB rosters - The Athletic
How Puerto Rican Baseball Icon Roberto Clemente Left a Legacy Off the Field
ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day
Roberto Clemente Day culminates with ceremony celebrating Jacob Stallings
Adam Wainwright wins MLB's Roberto Clemente Award