Nadiah, N.I., L.H. Cheng, M.E. Azhar, A.A. Karim, U. Uthumporn, and A.S. Ruri. 2015. “Determination of Phenolics and Antioxidant Properties in Tea and the Effects of Polyphenols on Alpha-Amylase Activity”. Pakistan Journal of Nutrition 14 (11): 808–817. https://doi.org/10.3923/pjn.2015.808.817.