Kheoruenromne, Irb, Anchalee Suddhiprakarn, and Attasit Wongmaneeroj. “Properties and Landscape Relationship of Skeletal Soils in Upper Northeast, Thailand”. Agriculture and Natural Resources 31, no. 2 (June 30, 1997): 237–253. accessed September 17, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/240827.