Phansi, Piyawan, and Pimmada Klaythongpan. “Development of Marl Soap and Marl Mixed with Butterfly Pea Flower Extract Soap”. Research on Modern science and Utilizing Technological Innovation Journal (RMUTI Journal) 17, no. 3 (October 31, 2024): 1–11. accessed August 28, 2026. https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/257352.