Ummartyotin, Sarute, and Hathaikarn Manuspiya. 2018. “Eggshell Waste: An Effective Source of Hydroxyapatite for Photocatalyst”. Journal of Metals, Materials and Minerals 28 (1). Bangkok, Thailand. https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/360.