Leba, Maria A.U., Erly G. Boelan, Maximus M. Taek, Sisilia D.B. Mau, Juvencio de C. Ruas, Maria B. Tukan, Adilson de C. Ruas, et al. “Exploring Purple Sweet Potato Pigment As An Eco-Friendly Titration Indicator for Acid Determination”. Tropical Journal of Natural Product Research (TJNPR) 8, no. 6 (June 29, 2024): 7403–7409. Accessed March 11, 2025. https://tjnpr.org/index.php/home/article/view/4193.