Columbia subject headings:
Harvard subject headings:
Language and languages--Congresses
Performing arts--Germany--History--Congresses.
Performing arts--Italy--History--Congresses.
Theater--Germany--History--Congresses.
Theater--Italy--History--Congresses.
Princeton subject headings:
Actors--Language.
Drama--History and criticism.
Language and languages in literature.
Theater.
Verse drama--Technique.