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Dyfyniad Arddull ChicagoAbbasi, S . A. Water Quality Sampling and Analysis. New Delhi: Discovery publishing house, 1998.
Dyfyniad MLAAbbasi, S . A. Water Quality Sampling and Analysis. Discovery publishing house, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.