Don't Ignore The Signs! How To Become An MLB Umpire.
Gibson makes final call: MLB umpire retires after 24-year career, Sports
MLB umpire Joe West has never missed a call. Just ask him - ESPN
Umpire (baseball) - Wikipedia
Eastern League's Matsuda working to become first major league umpire from Japan
MLB umpire job responsibilities
Grad walks away from pro umpire career to study law - University of Tennessee College of Law
MLB umpire job responsibilities
Will robo umpires be the end of the game as we know it? (SB Nation Reacts) - AZ Snake Pit
Beyond the Strike Zone: Exploring the Vital Role of Umpires in a Game - Ump Junk - Officials Gear
Commentary: Major-league ump Ed Rapuano backs Pope John Paul II
In Defense of Umpires: Why Complaints About MLB's 'Ump Show' Problem Miss the Mark, News, Scores, Highlights, Stats, and Rumors