Columbia subject headings:
Harvard subject headings:
English drama--20th century--History and criticism--Congresses.
English drama--21st century--History and criticism--Congresses.
Ethics in literature.
Theater--Great Britain--History--Congresses.
Princeton subject headings:
English drama--20th century--History and criticism--Congresses.
English drama--21st century--History and criticism--Congresses.
Ethics in literature.
Theater--Great Britain--History--Congresses.