Columbia subject headings:
Harvard subject headings:
Arts--Periodicals--Indexes--Databases.
Literature--Periodicals--Indexes--Databases.
Nación (Buenos Aires, Argentina)--Indexes--Databases.
Princeton subject headings:
Arts--Periodicals--Indexes--Databases.
Databases.
Indexes.
Literature--Periodicals--Indexes--Databases.
Nación (Buenos Aires, Argentina)--Indexes--Databases.