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Dyfyniad Arddull ChicagoMukhopadhyay, Parimal. Theory and Methods of Survey Sampling/2nd Ed. New Delhi: PHI learning, 2009.
Dyfyniad MLAMukhopadhyay, Parimal. Theory and Methods of Survey Sampling/2nd Ed. PHI learning, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.