Beard - Wikipedia
Uni Watch breaks down the 2017 slate of MLB uniforms - ESPN
Mattingly removes no facial hair policy
Miami Marlins' New Manager Outlaws Facial Hair On His Players - Newsy
Don Mattingly has relaxed the Marlins' facial hair policy
Miami Marlins' New Manager Outlaws Facial Hair On His Players - Newsy
Don Mattingly out as Marlins manager - Fish Stripes
Miami Marlins GM Kim Ng: Don Mattingly to return as manager in 2022
Miami Marlins CEO Derek Jeter says he's okay with facial hair - ESPN
New York Yankees appearance policy - Wikipedia
Don Mattingly has relaxed the Marlins' facial hair policy