Columbia subject headings:
Emotions in children--Testing--Congresses.
Emotions in infants--Testing--Congresses.
Expression in children--Congresses.
Facial expression--Congresses.
Harvard subject headings:
Emotions in children--Testing--Congresses.
Expression in children--Congresses.
Facial expression--Congresses.
Princeton subject headings:
Emotions in children--Testing--Congresses.
Facial expression--Congresses.