Columbia subject headings:
Developmental psychology--Longitudinal studies.
Developmental psychology--Research--Sweden.
Nature and nurture--Longitudinal studies.
Harvard subject headings:
Developmental psychology--Longitudinal studies.
Developmental psychology--Research--Sweden.
Nature and nurture--Longitudinal studies.
Princeton subject headings:
Developmental psychology--Longitudinal studies.
Developmental psychology--Research--Sweden.
Nature and nurture--Longitudinal studies.