It's time for the Yankees to update their facial hair policy - Pinstripe Alley
Don Mattingly enforces no facial hair rule with Marlins – New York Daily News
The Marlins changed their dumb facial hair policy, so players can have beards now
MLB Network to Air Don Mattingly Documentary April 3rd
Don Mattingly Enforcing No Facial Hair Policy On Florida Marlins
Toronto Blue Jays, Miami Marlins Trade Approved by MLB Commissioner Bud Selig
Don Mattingly Enforcing No Facial Hair Policy On Florida Marlins
Miami Marlins CEO Derek Jeter says he's okay with facial hair - ESPN
Don Mattingly has relaxed the Marlins' facial hair policy