Columbia subject headings:
Harvard subject headings:
Partito socialista italiano--History--19th century--Sources.
Socialism--Italy--Calabria--19th century--Sources.
Socialism--Italy--Calabria--History--19th century--Sources.
Princeton subject headings:
Partito socialista italiano--History--19th century--Sources.
Socialism--Italy--Calabria--History--19th century--Sources.