Columbia subject headings:
Ciriani, Marco, 1878-1944.
Socialism--Italy--History--20th century--Sources.
Socialists--Italy--Biography.
Harvard subject headings:
Ciriani, Marco, 1878-1944.
Socialism--Italy--History--20th century--Sources.
Socialists--Italy--Biography
Princeton subject headings:
Ciriani, Marco, 1878-1944.
Socialism--Italy--20th century--History--Sources.
Socialists--Italy--Biography.