Umps on attacks: Enough, already
Umpires Are Less Blind Than They Used To Be
MLB umpire job responsibilities
The History of Umpiring
Umpire The Winning Run
MLB umpire job responsibilities
Don't Ignore The Signs! How To Become An MLB Umpire.
Eastern League's Matsuda working to become first major league umpire from Japan
MLB umpires are good at calling balls and strikes, but they need help - The Washington Post
If you aren't a white male, YER OUT of luck as an umpire - Global Sport Matters
Perspectives: Baseball umpires spur litigation in Minnesota – Minnesota Lawyer
Are MLB umpires ruining the sport of baseball? - Quora