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Dyfyniad Arddull ChicagoRogoff, Mare J., and Nicholas P. Williams F. Cheremisinoff. Encyclopedia of Environment and Pollution Control (4 Vols). Mumbai: Jaico Publishing House, 2003.
Dyfyniad MLARogoff, Mare J., and Nicholas P. Williams F. Cheremisinoff. Encyclopedia of Environment and Pollution Control (4 Vols). Jaico Publishing House, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.