Kungsuwan, K., K. Singh, S. Phetkao, and N. Utama-ang. “Effects of PH and Anthocyanin Concentration on Color and Antioxidant Activity of Clitoria Ternatea Extract”. Food and Applied Bioscience Journal, Vol. 2, no. 1, 1, pp. 31-46, doi:10.14456/fabj.2014.3.