Dyfyniad APA

(1976). Agronomic - economic research on tropical soils. Annual report for 1975. USA: U.S.Agency for International Development.

Dyfyniad Arddull Chicago

Agronomic - Economic Research On Tropical Soils. Annual Report for 1975. USA: U.S.Agency for International Development, 1976.

Dyfyniad MLA

Agronomic - Economic Research On Tropical Soils. Annual Report for 1975. USA: U.S.Agency for International Development, 1976.

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