Berg,,Gerald, & Berg , G.. (1978). Indicators of viruses in water and food. Ann arbor science.
Dyfyniad Arddull ChicagoBerg,,Gerald, and Gerald Berg. Indicators of Viruses in Water and Food. Michigan: Ann arbor science, 1978.
Dyfyniad MLABerg,,Gerald, and Gerald Berg. Indicators of Viruses in Water and Food. Ann arbor science, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.