Columbia subject headings:
Harvard subject headings:
Heidegger, Martin, 1889-1976
Kierkegaard, Søren, 1813-1855
Philosophy, Danish--19th century.
Philosophy, German--20th century.
Princeton subject headings:
Heidegger, Martin, 1889-1976.
Kierkegaard, Søren, 1813-1855.