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Dyfyniad Arddull ChicagoFederer, Walter Theodore. Experimental Design: Theory and Application. Nueva York: McMillan, 1955.
Dyfyniad MLAFederer, Walter Theodore. Experimental Design: Theory and Application. McMillan, 1955.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.