Umpire (baseball) - Wikipedia
Minor League Umpires To Receive Significant Pay Raise In 2022 — College Baseball, MLB Draft, Prospects - Baseball America
How Much Are MLB Umpires Paid?, News, Scores, Highlights, Stats, and Rumors
A Longtime Umpire Says He Is Gay - The New York Times
Major league umpires wear wristbands to protest 'escalating verbal attacks' from players
MLB Official Information
Umpires, MLB agree on instant replay - The San Diego Union-Tribune
Beyond the grunt: Umpires mic up, and baseball changes a bit
MLB Umpire Microphones in Action as 2022 Season Nears - Crew Chief Ted Barrett's PA Announcements
MLB, Official Information, Umpires
MLB umpire job responsibilities
Ten MLB Umpires Set To Retire Ahead Of The 2023 Season
Why is MLB still using 6 umpires in postseason games? - Bleed Cubbie Blue
MLB umpires' union clarifies use of electronics at spring training sites - ESPN
A New Study Shows Umpire Discrimination Against Non-White Players - Baseball ProspectusBaseball Prospectus