Columbia subject headings:
Swiss literature--20th century--Congresses.
Harvard subject headings:
French literature--20th century--History and criticism
Italian literature--20th century--History and criticism
Italian literature--Switzerland--History and criticism.
Raeto-Romance literature--20th century--History and criticism.
Swiss literature (French)--History and criticism.
Swiss literature (German)--20th century--History and criticism.
Swiss literature--20th century--History and criticism--Congresses.
Princeton subject headings:
Swiss literature--20th century--Congresses.