MLB's 2021 Rules: NL DH Thrown Out but 7-Inning Doubleheaders Stay
Weekly Blog Question! How Do You Feel About the Designated Hitter (DH) Being Added to the National League?
What would a National League designated hitter mean for the Yankees? - Pinstripe Alley
First designated hitter Ron Blomberg proud to be father of position
The Historical Evolution of the Designated Hitter Rule – Society for American Baseball Research
The National League should adopt the designated hitter - Bless You Boys
Nightengale: Don't bet against NL adopting DH
A Brief History of the Arguments About the Designated Hitter - The Ringer
Hall of Famers who benefited from designated hitter rule
Designated hitter here to stay (apparently)