Esterlin, E. Nursaadah, R. W. Wardana, dan M. L. Firdaus, “The Use of Telang Flower Extract (Clitoria ternatea L.) as a Natural Universal pH Indicator coupled with Digital Image Colorimetry”, pendipa. jurnal. pendik. sains, vol. 8, no. 3, hlm. 480–487, Des 2024.