Dyfyniad APA

World Health Organization. (2012). Bulletin of the World Health Organization. WHO.

Dyfyniad Arddull Chicago

World Health Organization. Bulletin of the World Health Organization. Geneva, Switzerland: WHO, 2012.

Dyfyniad MLA

World Health Organization. Bulletin of the World Health Organization. WHO, 2012.

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