Columbia subject headings:
Piaget, Jean, 1896-1980--Congresses.
Social interaction in children--Congresses.
Social perception in children--Congresses.
Harvard subject headings:
Piaget, Jean, 1896-1980--Congresses.
Social interaction in children--Congresses.
Social perception in children--Congresses.
Princeton subject headings:
Piaget, Jean, 1896---Congresses.
Social interaction in children--Congresses.
Social perception in children--Congresses.