MLB, Official Information, Umpires
Is Pat Hoberg the Greatest MLB Umpire of This Generation? - The Forkball
Umpire (baseball) - Wikipedia
How Much Do MLB Umpires Make? - JobsInSports Blog
Umpire (baseball) - Wikipedia
Umpires, MLB agree on instant replay - The San Diego Union-Tribune
MLB umpire Eric Cooper dies at 52; did playoffs 2 weeks ago
Coronavirus Florida: Umpires and officials also out of work
Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe