Major-League Umpiring during the Pandemic of 2020 - Baseball ProspectusBaseball Prospectus
Major League Baseball: Most Up-to-Date Encyclopedia, News & Reviews
MLB umpire retirements, promotions
Some MLB umpires will opt out of the 2020 season over covid-19 fears - The Washington Post
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11 MLB umpires have opted out of 2020 season, per report
How MLB is navigating the coronavirus pandemic to play ball - ESPN
CBD Makes the Big Leagues: MLB, Charlotte's Web Strike $30.5M Sponsorship Deal
When the Fans Didn't Go Wild: The 2020 MLB Season as a Natural Experiment on Home Team Performance. - Document - Gale Academic OneFile
Major League Baseball needs a settlement to keep fans' interest
MLBUC│Major League Baseball Umpire Camps
National Baseball Hall Of Fame And Museum: Most Up-to-Date Encyclopedia, News & Reviews
Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe
COVID-19: How will MLB operate? Here's some of the new rules - Los Angeles Times
What the MLB deal with players means for 2020 season and beyond - ESPN
Mack's Mets: John From Albany – Mets Breakfast Links 4/20/2020