Semi-detailed soil survey of the Kedah/Perlis Coastal Plain - Soo, Swee Weng; Malaysia. Kementerian Pertanian dan Perikanan. Bahagian Pertanian. Cawangan Perkhidmatan Tanah dan Analisa (Kuala Lumpur : Soils and Analytical Services Branch, Division of Agriculture, Ministry of Agriculture and Fisheries, 1972)
Keywords: Soil survey -- Kedah; Soil survey -- Perlis