Columbia subject headings:
Harvard subject headings:
Ethics.
Freud, Sigmund, 1856-1939
Jung, C. G. (Carl Gustav), 1875-1961
Marx, Karl, 1818-1883
Princeton subject headings:
Ethics.
Freud, Sigmund, 1856-1939.
Jung, C. G. (Carl Gustav), 1875-1961.
Marx, Karl, 1818-1883.