New Jersey politicians move to retire Roberto Clemente's No. 21
Retire Twenty One
Pittsburgh Pirates Roberto Clemente number 21 should be retired
Roberto Clemente Remembered as a Humanitarian at Commemoration
Retire Twenty One
Here's why it would be a bad idea for MLB to retire Roberto
Reading Fightin Phils retire Roberto Clemente's number 21
Curve to retire No. 21, honor Roberto Clemente and family
Roberto Clemente - Primary Resources: Plane Crash
Clemente's #21 will not be retired across MLB despite report