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Dyfyniad Arddull ChicagoHèoll, Karl, Helmut Peter, and Dietrich Lèu demann. Water: Examination, Assessment, Conditioning, Chemistry, Bacteriology, Biology. Berlin: Walter De Gruyter, 1982.
Dyfyniad MLAHèoll, Karl, et al. Water: Examination, Assessment, Conditioning, Chemistry, Bacteriology, Biology. Walter De Gruyter, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.