Norman W Hudson. (1987). FAO soils bulletin N.57: Soil and water conservation in semi-arid areas. Rome: FAO.
Trích dẫn kiểu ChicagoNorman W Hudson. FAO Soils Bulletin N.57: Soil and Water Conservation in Semi-arid Areas. Rome: FAO, 1987.
Deismireacht MLANorman W Hudson. FAO Soils Bulletin N.57: Soil and Water Conservation in Semi-arid Areas. Rome: FAO, 1987.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.