MLB Umpires Talk Yankees' Aaron Boone's Ejections: 'The Whole Thing Is Funny', News, Scores, Highlights, Stats, and Rumors
MLB 2023 season: Breaking down all of the league's tech updates
Robot umpires and other rule changes: Coming soon to an MLB stadium near you! - Camden Chat
POV: Bad Umpiring Hurt Baseball in 2021, Especially in the Playoffs. It's Time for Change, BU Today
The MLB Umpires Association is a flawed and opaque organization - Bleed Cubbie Blue
Testimonials, Major League Baseball Umpire Camps
Kerwin Danley, Alfonso Marquez make MLB history with promotion to crew chief
Best power-speed combo seasons in MLB history
Joe West retires as umpire after record 5,460 games; Roberto Ortiz becomes first Puerto Rican to be full-time ump - ESPN
Instant replay in Major League Baseball - Wikipedia
MLB will see 10 rookie umps replace veterans as position faces more changes, challenges than ever - The Athletic
Umpire (baseball) - Wikipedia
Roberto Ortiz makes MLB umpire history as league replaces Joe West, other retirees