World Health Organization & ebrary, Inc. (2006). Air quality guidelines: Global update 2005 : particulate matter, ozone, nitrogen dioxide, and sulfur dioxide. World Health Organization.
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Dyfyniad Arddull Chicago
World Health Organization and Inc ebrary. Air Quality Guidelines: Global Update 2005 : Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. Copenhagen, Denmark: World Health Organization, 2006.
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Dyfyniad MLA
World Health Organization and Inc ebrary. Air Quality Guidelines: Global Update 2005 : Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. World Health Organization, 2006.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.