Columbia subject headings:
Literature, Modern--20th century--History and criticism.
Postmodernism.
Harvard subject headings:
Literature, Modern--20th century--History and criticism
Literature, Modern--20th century--History and criticism--Theory, etc.
Postmodernism (Literature)
Postmodernism.
Princeton subject headings:
Literature, Modern--20th century--History and criticism.
Postmodernism.