Dyfyniad APA

FAO. (1992). FAO soils bulletin N.65: Status of cadmium, lead, cobalt and selenium in soils and plants of thirty countries. Rome: FAO.

Dyfyniad Arddull Chicago

FAO. FAO Soils Bulletin N.65: Status of Cadmium, Lead, Cobalt and Selenium in Soils and Plants of Thirty Countries. Rome: FAO, 1992.

Dyfyniad MLA

FAO. FAO Soils Bulletin N.65: Status of Cadmium, Lead, Cobalt and Selenium in Soils and Plants of Thirty Countries. Rome: FAO, 1992.

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