Dyfyniad APA

Davey, S. (2002). State of the world's vaccines and immunization. World Health Organization.

Dyfyniad Arddull Chicago

Davey, Sheila. State of the World's Vaccines and Immunization. Geneva: World Health Organization, 2002.

Dyfyniad MLA

Davey, Sheila. State of the World's Vaccines and Immunization. World Health Organization, 2002.

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