Columbia subject headings:
Harvard subject headings:
Nietzsche, Friedrich Wilhelm, 1844-1900--Influence--Yeats.
Philosophy in literature.
Yeats, W. B. (William Butler), 1865-1939--Philosophy.
Princeton subject headings:
Nietzsche, Friedrich Wilhelm, 1844-1900--Influence.
Yeats, W. B. (William Butler), 1865-1939--Philosophy.