Columbia subject headings:
Harvard subject headings:
Rhetoric--History--Congresses.
Silence (Philosophy)--Congresses.
Silence in literature--Congresses.
Silence--Cross-cultural studies--Congresses.
Princeton subject headings:
Rhetoric--History--Congresses.
Silence (Philosophy)--Congresses.
Silence in literature--Congresses.
Silence--Cross-cultural studies--Congresses.