Columbia subject headings:
Wolff, Christian, Freiherr von, 1679-1754.
Harvard subject headings:
Wolff, Christian, Freiherr von, 1679-1754.
Princeton subject headings:
Ontology.
Philosophy, Modern--18th century.
Wolff, Christian, Freiherr von, 1679-1754--Criticism and interpretation.
Wolff, Christian, Freiherr von, 1679-1754--Ethics.