Phansi, Piyawan, and Pimmada Klaythongpan. 2024. “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 (3):1-11. https://ph01.tci-thaijo.org/index.php/rmutijo/article/view/257352.