Start with high-confidence drama criticism books, then narrow by subgenre or adjacent topics.
The Birth of Tragedy
Friedrich Nietzsche, Michael Tanner
Poetics
Aristotle, Malcolm Heath
The Roaring Girl
Paul Mulholland
Bartholomew Fair
Suzanne Gossett
Brecht on Theatre
Bertolt Brecht, Steve Giles
The Sultan Speaks
L. McJannet, Linda McJannet
