Athikomkulchai, Sirivan, Panida Vayumhasuwan, Sujimon Tunvichien, Sirirak Piyapong, Sopa Malaipuang, and Nijsiri Ruangrungsi. 2018. “The Development of Sunscreen Products from Kaempferia galanga”. Journal of Health Research 21 (4):253-56. https://he01.tci-thaijo.org/index.php/jhealthres/article/view/154181.