FAQ for 2020 baseball season
Baseball rules - Wikipedia
MLB shortened season: Keep some of the new rules around
For openers: MLB tries again with short season, skewed rules
MLB rules changes refresher for 2023 season
Short season with skewed rules for MLB this summer
New baseball rules for 2023 FAQ
MLB Official Baseball Rules, Annotated: Game Preliminaries (Part 4) - Baseball ProspectusBaseball Prospectus
New baseball rules for 2023 FAQ
Opinion Play Ball? Sports Amid the Coronavirus - The New York Times
Baseball's New Rules: No Spitting, No Arguing, and Lots of Testing - The New York Times