Columbia subject headings:
Ethics in motion pictures--Congresses.
Motion pictures--Aesthetics--Congresses.
Motion pictures--Portugal--History--Congresses.
Harvard subject headings:
Ethics in motion pictures--Congresses.
Motion pictures--Aesthetics--Congresses.
Motion pictures--Portugal--History--Congresses.
Princeton subject headings:
Ethics in motion pictures--Congresses.
Motion pictures--Aesthetics--Congresses.
Motion pictures--Portugal--History--Congresses.