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Dyfyniad Arddull ChicagoRaj, Des, and Promod Chandhok. Sample Survey Theory. hennai: Narosa, 1988.
Dyfyniad MLARaj, Des, and Promod Chandhok. Sample Survey Theory. Narosa, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.