Columbia subject headings:
Italian drama--History--20th century.
Italian drama--History--21st century.
Theater--Italy--History--20th century.
Theater--Italy--History--21st century.
Harvard subject headings:
Drama--20th century--History and criticism
Drama--21st century--History and criticism.
Theater--Italy--History--20th century
Theater--Italy--History--21st century.
Princeton subject headings: