Columbia subject headings:
Harvard subject headings:
Ingarden, Roman, 1893-1970
Philosophy, Polish--20th century.
Princeton subject headings:
Ingarden, Roman, 1893-1970--Contributions in aesthetics.
Ingarden, Roman, 1893-1970--Contributions in ontology.
Ingarden, Roman, 1893-1970.
Philosophy, Modern--20th century.