Dyfyniad APA

(1987). Biological substances: International standards and reference reagents, 1986. World Health Organization.

Dyfyniad Arddull Chicago

Biological Substances: International Standards and Reference Reagents, 1986. Geneva: World Health Organization, 1987.

Dyfyniad MLA

Biological Substances: International Standards and Reference Reagents, 1986. World Health Organization, 1987.

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