Keosivongsa, Lattana, Watcharapong Wararam, and Onanong PhewnI. 2024. “Absorption and Desorption of Lead and Manganese in Clay-Textured Soil”. Journal of Modern Learning Development 9 (12):28-40. https://so06.tci-thaijo.org/index.php/jomld/article/view/275868.