Columbia subject headings:
Informal sector (Economics)--Measurement.
Women--Employment--Measurement.
Harvard subject headings:
Housewives--Research--Methodology.
Informal sector (Economics)--Employees--Research--Methodology.
Women--Employment--Research--Methodology.
Princeton subject headings:
Housewives--Research--Methodology.
Informal sector (Economics)--Employees--Research--Methodology.
Women--Employment--Research--Methodology.