(1976). Agronomic - economic research on tropical soils. Annual report for 1975. USA: U.S.Agency for International Development.
Trích dẫn kiểu ChicagoAgronomic - Economic Research On Tropical Soils. Annual Report for 1975. USA: U.S.Agency for International Development, 1976.
Deismireacht MLAAgronomic - Economic Research On Tropical Soils. Annual Report for 1975. USA: U.S.Agency for International Development, 1976.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.