Columbia subject headings:
Harvard subject headings:
Music and literature--Congresses.
Pirandello, Luigi, 1867-1936--Contributions in opera--Congresses.
Pirandello, Luigi, 1867-1936--Criticism and interpretation--Congresses.
Princeton subject headings:
Music and literature--Congresses.
Pirandello, Luigi, 1867-1936--Contributions in opera--Congresses.
Pirandello, Luigi, 1867-1936--Criticism and interpretation--Congresses.