Dyfyniad APA

World Health Organization. (2003). State of the world's vaccines and immunization. World Health Organisation.

Dyfyniad Arddull Chicago

World Health Organization. State of the World's Vaccines and Immunization. Geneva: World Health Organisation, 2003.

Dyfyniad MLA

World Health Organization. State of the World's Vaccines and Immunization. World Health Organisation, 2003.

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