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Dyfyniad Arddull ChicagoBriggs, D. Corvalan. Linkage Methods for Environment and Health Analysis: General Guidelines. Geneva: World Health Organization, 1996.
Dyfyniad MLABriggs, D. Corvalan. Linkage Methods for Environment and Health Analysis: General Guidelines. World Health Organization, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.