Columbia subject headings:
Harvard subject headings:
Pirandello, Luigi, 1867-1936--Criticism and interpretation--Congresses.
Theater--Italy--History--Congresses.
Princeton subject headings:
Pirandello, Luigi, 1867-1936--Criticism and interpretation--Congresses.
Pirandello, Luigi, 1867-1936--Stage history--Congresses.
Theater--History--20th century--Congresses.