Dyfyniad APA

FAO. (1998). World soil resources reports N84: World reference base for soil resources. Rome: FAO.

Dyfyniad Arddull Chicago

FAO. World Soil Resources Reports N84: World Reference Base for Soil Resources. Rome: FAO, 1998.

Dyfyniad MLA

FAO. World Soil Resources Reports N84: World Reference Base for Soil Resources. Rome: FAO, 1998.

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