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Dyfyniad Arddull ChicagoBitton, Gabriel. Encyclopedia of Environmental Microbiology. New York: John Wiley & Sons, 2002.
Dyfyniad MLABitton, Gabriel. Encyclopedia of Environmental Microbiology. John Wiley & Sons, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.