Columbia subject headings:
Bergson, Henri, 1859-1941.
Boutroux, Emile, 1845-1921.
Rickert, Heinrich, 1863-1936.
Harvard subject headings:
Bergson, Henri, 1859-1941
Boutroux, Emile, 1845-1921
Rickert, Heinrich, 1863-1936
Princeton subject headings: