R. saputra, N. Julianti, A. Firmansyah, R. Amir, A. Dhana Rizkita, and S. Ayu Dewi, “Effect Of The Extraction Methods On The Identification Of Caffeine In The Extract Of Dragon Fruit Peel”, ijcs, vol. 12, no. 3, pp. 278-287, Nov. 2023.