Columbia subject headings:
Deussen, Paul, 1845-1919--Criticism and interpretation.
Freud, Sigmund, 1856-1939--Criticism and interpretation.
Nietzsche, Friedrich Wilhelm, 1844-1900--Criticism and interpretation.
Schopenhauer, Arthur, 1788-1860--Influence.
Harvard subject headings:
Deussen, Paul, 1845-1919--Criticism and interpretation.
Freud, Sigmund, 1856-1939--Criticism and interpretation.
Nietzsche, Friedrich Wilhelm, 1844-1900--Criticism and interpretation.
Philosophy, Modern--19th century.
Philosophy, Modern--20th century.
Schopenhauer, Arthur, 1788-1860--Influence.
Princeton subject headings:
Deussen, Paul, 1845-1919--Criticism and interpretation.
Freud, Sigmund, 1856-1939--Criticism and interpretation.
Nietzsche, Friedrich Wilhelm, 1844-1900--Criticism and interpretation.
Schopenhauer, Arthur, 1788-1860--Influence.