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Dyfyniad Arddull ChicagoSchuenemeyer, John H. Statistics for Earth and Environemental Scientists. New Jersey: John wiley, 2011.
Dyfyniad MLASchuenemeyer, John H. Statistics for Earth and Environemental Scientists. John wiley, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.