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Dyfyniad Arddull ChicagoEaton ,andrew D, and Lenore S. Greebnberg Clesceri. Standard Methods for the Examination of Water and Wastewater. Washington: AHP, 1992.
Dyfyniad MLAEaton ,andrew D, and Lenore S. Greebnberg Clesceri. Standard Methods for the Examination of Water and Wastewater. AHP, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.