Columbia subject headings:
Nietzsche, Friedrich Wilhelm, 1844-1900--Psychology.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Wagner, Richard, 1813-1883.
Harvard subject headings:
Nietzsche, Friedrich Wilhelm, 1844-1900
Nietzsche, Friedrich Wilhelm, 1844-1900--Psychology.
Wagner, Richard, 1813-1883
Princeton subject headings:
Nietzsche, Friedrich Wilhelm, 1844-1900--Psychology.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Wagner, Richard, 1813-1883.