World Health Organization, UNICEF, & ebrary, Inc. (2010). Progress on sanitation and drinking water: 2010 update. World Health Organization.
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Dyfyniad Arddull Chicago
World Health Organization, UNICEF, and Inc ebrary. Progress on Sanitation and Drinking Water: 2010 Update. Geneva: World Health Organization, 2010.
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Dyfyniad MLA
World Health Organization, et al. Progress on Sanitation and Drinking Water: 2010 Update. World Health Organization, 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.