Columbia subject headings:
Brecht, Bertolt, 1898-1956--Criticism and interpretation.
Literature.
Harvard subject headings:
Brecht, Bertolt, 1898-1956--Criticism and interpretation.
Literature
Princeton subject headings:
Brecht, Bertolt, 1898-1956--Poetic works.
Literature--History and criticism--Theory, etc.
Semiotics.