Lua APA (7ú heag.)

World Health Organization World Plumbing Council. (2006). Health aspects of plumbing. World health Organization.

Lua i Stíl Chicago (17ú heag.)

World Health Organization World Plumbing Council. Health Aspects of Plumbing. Geneva: World health Organization, 2006.

Lua MLA (8ú heag.)

World Health Organization World Plumbing Council. Health Aspects of Plumbing. World health Organization, 2006.

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