The Historical Evolution of the Designated Hitter Rule – Society for American Baseball Research
The National League should adopt the designated hitter - Bless You Boys
Baseball - Wikipedia
Oakland A's news: Players reject offer to add universal DH and expanded postseason for 2021 - Athletics Nation
Why aren't there more hitting pitchers in Major League Baseball? - Quora
How the Universal DH Can Impact MLB Season Props - Oddstrader
MLB Creates 'Ohtani Rule' to Keep Star's Bat in Games - The New York Times
MLB News: DH comes to NL - McCovey Chronicles
Pitch Clocks, the Universal DH, and Other Proposed MLB Rule Changes - The Ringer
Designated hitter - Wikipedia
MLB: As National League installs DH, will pitchers ever hit again?
Why MLB's DH rule could be heading to National League - Los Angeles Times
MLB Pitchers' Toughest 2021 Challenge: Keeping Their Arms Intact - WSJ
MLB, Players' Union Agree to 7-Inning Doubleheaders, Extra Innings Runner for 2021 - WSJ
The universal DH had its roots a half-century ago in the American League - The Washington Post