Columbia subject headings:
Cognition in children--Congresses.
Piaget, Jean, 1896-1980--Congresses.
Harvard subject headings:
Cognition--Congresses.
Knowledge, Theory of--Congresses
Piaget, Jean, 1896-1980--Congresses.
Princeton subject headings:
Knowledge, Theory of--Congresses.
Piaget, Jean, 1896---Congresses.