World Health Organization, ebrary, Inc, & Adams, J. (2009). Water, sanitation and hygiene standards for schools in low-cost settings. World Health Organization.
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Dyfyniad Arddull Chicago
World Health Organization, Inc ebrary, and John Adams. Water, Sanitation and Hygiene Standards for Schools in Low-cost Settings. Geneva, Switzerland: World Health Organization, 2009.
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Dyfyniad MLA
World Health Organization, et al. Water, Sanitation and Hygiene Standards for Schools in Low-cost Settings. World Health Organization, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.