Columbia subject headings:
Foreign trade regulation--Nigeria--Periodicals.
Nigeria--Commerce--Periodicals.
Nigeria--Commercial policy--Periodicals.
Harvard subject headings:
Foreign trade regulation--Nigeria--Periodicals.
Nigeria--Commerce--Periodicals.
Nigeria--Commercial policy--Periodicals.
Princeton subject headings:
Balance of trade--Nigeria--Periodicals.
Foreign trade regulation--Nigeria--Periodicals.
Nigeria--Commercial policy--Periodicals.
Periodicals.