Gay umpire Dale Scott's autobiography comes out a winner - Outsports
Are MLB umpires ruining the sport of baseball? - Quora
Umpire (baseball) - Wikipedia
MLB umpires have a new signal to call this spring - Sports Illustrated
The story of Canada's lone MLB umpire: From Saskatchewan to The Show
MLB: Umpire Hernández blew calls, losing World Series job
Umpire: What Is It? and How to Become One?
Robot Umpires Could Be Coming to MLB as Soon as 2024 - CNET
Don't Ignore The Signs! How To Become An MLB Umpire.
Observations of Umpires at Work – Society for American Baseball Research
MLB umpire Joe West has never missed a call. Just ask him - ESPN