Yankees great Don Mattingly once spoke about his main gripe with his infamous haircut benching saga
New York Yankees - Wikipedia
Who has a mustache on the Yankees? Why Matt Carpenter's facial hair doesn't violate team rules
Yankees great Don Mattingly once spoke about his main gripe with his infamous haircut benching saga
Matt Carpenter joins list of great Yankees mustaches
Faster Than A Shark: Yankee Mustaches: A Growing Problem.
Who has a mustache on the Yankees? Why Matt Carpenter's facial hair doesn't violate team rules
Don Mattingly, Raised a Yankee and Happy to Be a Dodger - The New York Times
The Scruffy Story of Why the New York Yankees Can Never Have Facial Hair
Don Mattingly Once Lost His Starting Job With the Yankees Because of His Haircut