Pruangka, Suttipong, and Mongkon Ta-oun. 2016. “Effect of spent wash liquor on soil pH, electrical conductivity, organic matter, extractable calcium and magnesium of coarse-textured and fine-textured soils”. Engineering and Applied Science Research 43 (November):299-302. https://ph01.tci-thaijo.org/index.php/easr/article/view/70232.