Dyfyniad APA

(2009). World health statistics 2009. World Health Organization.

Dyfyniad Arddull Chicago

World Health Statistics 2009. Paris: World Health Organization, 2009.

Dyfyniad MLA

World Health Statistics 2009. World Health Organization, 2009.

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