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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Cita Chicago (17th ed.)
World Health Organization, Inc ebrary, i John Adams. Water, Sanitation and Hygiene Standards for Schools in Low-cost Settings. Geneva, Switzerland: World Health Organization, 2009.
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Cita MLA (9th ed.)
World Health Organization, et al. Water, Sanitation and Hygiene Standards for Schools in Low-cost Settings. World Health Organization, 2009.
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Atenció: Aquestes cites poden no estar 100% correctes.