Columbia subject headings:
Verdi, Giuseppe, 1813-1901--Criticism and interpretation.
Verdi, Giuseppe, 1813-1901. Operas.
Harvard subject headings:
Verdi, Giuseppe, 1813-1901--Criticism and interpretation.
Verdi, Giuseppe, 1813-1901. Operas.
Princeton subject headings:
Opera--Italy--19th century.
Verdi, Giuseppe, 1813-1901--Criticism and interpretation.