The MLB Umpires Association is a flawed and opaque organization - Bleed Cubbie Blue
Robot Umpires Could Be Coming to MLB as Soon as 2024 - CNET
Should MLB use an automated strike zone in place of umps? “Yes, a thousand percent yes.” – The Denver Post
10 Secrets of MLB Umpires
The story of Canada's lone MLB umpire: From Saskatchewan to The Show
Beyond the Strike Zone: Exploring the Vital Role of Umpires in a Game - Ump Junk - Officials Gear
Umpire: What Is It? and How to Become One?
MLB umpire rankings: Pat Hoberg is baseball's most accurate ump
MLB umpire Dale Scott retires rather than risk more concussions – The Denver Post
Former MLB Umpire, Meriwether, Dead at 63
Gibson makes final call: MLB umpire retires after 24-year career, Sports
The Role Of An Umpire - Athletics Nation