Robot umpires: How it works and its effect on players and managers in the Atlantic League, plus what's to come
AI Takeover, Part I: Will Some Catchers Be Pushed out of Baseball When the Robot Umpires Arrive?
Talking with Padres closer, bow hunter and fake-skin-tatooer Josh Hader - The San Diego Union-Tribune
The History of Umpiring
As They See 'Em: A Fan's Travels in the Land of Umpires: Weber, Bruce: 9780743294119: : Books
The Commissioner Speaks: Imagining a Redefined Strike Zone
Pitching Data Helps Quantify Umpire Mistakes
Change in gear was a strike for consistent umpiring
Umpire Scorecard says Laz Diaz missed 19 strike calls in Yankees manager Aaron Boone ejection game
Observations of Umpires at Work – Society for American Baseball Research
Definition of the Little League® Strike Zone - Little League