Smith, P. G. (2002). Dictionary of water and waste management. Oxford: Butterworth-Heinemann.
Dyfyniad Arddull ChicagoSmith, Paul G. Dictionary of Water and Waste Management. Oxford: Butterworth-Heinemann, 2002.
Dyfyniad MLASmith, Paul G. Dictionary of Water and Waste Management. Oxford: Butterworth-Heinemann, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.