Columbia subject headings:
Brecht, Bertolt, 1898-1956--Criticism, interpretation, etc.--Congresses.
Harvard subject headings:
Brecht, Bertolt, 1898-1956--Criticism and interpretation--Congresses.
Princeton subject headings:
Brecht, Bertolt, 1898-1956--Criticism and interpretation.
Hauptmann, Elisabeth--Criticism and interpretation.
Müller, Heiner, 1929---Criticism and interpretation.