MLB, Umpires Association reach five-year labor agreement - Sports Illustrated
SportTechie's 2019 Outstanding Innovation: Automated Strike Zones
MLB to host Umpire Prospect Development Camp
Association of Minor League Umpires
MLB's collective bargaining agreement: Guide to the changes in the 2022-26 labor deal - The Athletic
Sorting through the umpire controversy - Beyond the Box Score
Cardinals' Alec Burleson laments eighth-inning at-bat altered by umpire's calls
Major League Baseball agrees to pay minor leaguers $185 million to settle federal suit - The Boston Globe
Umpire hospitalized after being hit in head by throw at Yankees-Guardians MLB game
The umpire on the cusp of a watershed moment for baseball: 'I think she's going to do it' - The Athletic
MLB to test pitch clock, 'robo umps' in minor leagues in 2002 - Sports Illustrated