Dyfyniad APA

World Health Organization. (2012). World health statistics 2012. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. World Health Statistics 2012. Geneva, Switzerland: World Health Organization, 2012.

Dyfyniad MLA

World Health Organization. World Health Statistics 2012. World Health Organization, 2012.

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