Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.