S. Tamaroh, S. Raharjo, A. Murdiati, and S. Anggrahini, “Total Phenolic Content and Antioxidant Activity of Anthocyanin Extract from Purple Yam (Dioscorea alata L.) Flour Using Different Solvents”, Pak. J. Nutr., vol. 17, no. 6, pp. 260–267, May 2018, doi: 10.3923/pjn.2018.260.267.