De VargasT.BrattJ. H.DayaratnaV.ForeitJ. R.KressD. H. (April 1998). Estimating consumer response to price changes in family planning and reproductive health services. Paper presented at the annual meeting of the Population Association of America, Chicago, IL.
2.
LewisM. A. (1986). Do contraceptive prices affect demand?Studies in Family Planning, 17(3), 126–135.
3.
NATIONAL INSTITUTE OF POPULATION STUDIES AND IRD/MACRO INTERNATIONAL. (1992). Pakistan Demographic and Health Survey 1990/1991.Columbia, MD: Author.
4.
PortnoyP. R. (1994). The contingent valuation debate: Why economists should care. Journal of Economic Perspectives, 8(4), 3–17.