Dyfyniad APA

(1991). Biological Substances: International Standards and Reference Reagents. World Health Organization.

Dyfyniad Arddull Chicago

Biological Substances: International Standards and Reference Reagents. Geneva: World Health Organization, 1991.

Dyfyniad MLA

Biological Substances: International Standards and Reference Reagents. World Health Organization, 1991.

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