R. A. Zayadi, N. Abdul Rahim, and F. Abu Bakar, “Determination of Flavonoid and Caffeine Content in Black and Oolong Teas”, jst, vol. 8, no. 2, Nov. 2016, Accessed: May 04, 2024. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/JST/article/view/1747