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Dyfyniad Arddull ChicagoLe, Thanh N., and Vijay K. Verma. An Analysis of Sample Designs and Sampling Errors of the Demographic and Health Surveys. Calverton, Md.: Macro International, 1997.
Dyfyniad MLALe, Thanh N., and Vijay K. Verma. An Analysis of Sample Designs and Sampling Errors of the Demographic and Health Surveys. Macro International, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.