Hayeeyoosoh, Bismee, Saluma Samanman, Amin Fatoni, Sitimaryam Salaehsa, Aslan Hilae, Irfan Masaesai, and Anusa Suwanwong. 2023. “Purple Sweet Potato Extract Immobilization in Natural Rubber Films: A Potential Application for the Detection of Fe(III)”. Pridiyathorn Science Journal 1 (2). Narathiwat, Thailand:86-100. https://li04.tci-thaijo.org/index.php/psj/article/view/1150.