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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Chicago Style (17th ed.) Zitazioa
World Health Organization, Inc ebrary, eta John Adams. Water, Sanitation and Hygiene Standards for Schools in Low-cost Settings. Geneva, Switzerland: World Health Organization, 2009.
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MLA (9th ed.) Zitazioa
World Health Organization, et al. Water, Sanitation and Hygiene Standards for Schools in Low-cost Settings. World Health Organization, 2009.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.