Here's why it would be a bad idea for MLB to retire Roberto Clemente's No. 21
Carlos Delgado says MLB should retire Roberto Clemente's No. 21
Fightins to Retire Roberto Clemente's #21 - BCTV
Curve to retire No. 21, honor Roberto Clemente and family
What Would Clemente Do? - Global Sport Matters
ESPN - On this date in 1972, Roberto Clemente recorded his 3000th hit in his final career at-bat.
Roberto Clemente Foundation 21
Remembering Roberto Clemente - Pittsburgh Latino Magazine
Roberto Clemente Day celebration around MLB
Roberto Clemente & his #21 on this New Year's Eve – Latino Sports