Dyfyniad APA

(2012). Progress on drinking water and sanitation. UNICEF and World Health Organization.

Dyfyniad Arddull Chicago

Progress on Drinking Water and Sanitation. New York: UNICEF and World Health Organization, 2012.

Dyfyniad MLA

Progress on Drinking Water and Sanitation. UNICEF and World Health Organization, 2012.

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