NGAMDEE, P., and S. JIAMYANGYUEN. “Effective Antioxidant Activities of Anthocyanins As Affected by PH of Antioxidant Assays”. Walailak Journal of Science and Technology (WJST), vol. 16, no. 11, Feb. 2018, pp. 875-8, doi:10.48048/wjst.2019.4341.