Columbia subject headings:
Nigeria--Social policy--Congresses.
Social sciences--Nigeria--Congresses.
Social sciences--Research--Nigeria--Congresses.
Harvard subject headings:
Nigeria--Social policy--Congresses.
Social sciences--Nigeria--Congresses.
Social sciences--Research--Nigeria--Congresses.
Princeton subject headings:
Nigeria--Social policy--Congresses.
Social sciences--Nigeria--Congresses.
Social sciences--Research--Nigeria--Congresses.