Columbia subject headings:
Wolff, Christian, Freiherr von, 1679-1754--Psychology.
Harvard subject headings:
Wolff, Christian, Freiherr von, 1679-1754--Psychology.
Wolff, Christian.
Princeton subject headings:
Wolff, Christian, Freiherr von, 1679-1754--Criticism and interpretation--Congresses.
Wolff, Christian, Freiherr von, 1679-1754--Psychology--Congresses.