Dyfyniad APA

World Health Organization. State of the world's vaccines and inmunization.

Dyfyniad Arddull Chicago

World Health Organization. State of the World's Vaccines and Inmunization.

Dyfyniad MLA

World Health Organization. State of the World's Vaccines and Inmunization.

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