Columbia subject headings:
Swiss drama (German)--20th century--History and criticism.
Swiss drama (German)--21st century--History and criticism.
Theater--Switzerland--History--20th century.
Harvard subject headings:
Swiss drama (German)--20th century--History and criticism--Congresses.
Swiss drama (German)--21st century--History and criticism--Congresses.
Theater--Switzerland--History--20th century--Congresses.
Theater--Switzerland--History--21st century--Congresses.
Princeton subject headings:
Swiss drama--20th century--History and criticism.
Swiss drama--21st century--History and criticism.