Wutticharoenmongkol, P., S. Sitthisan, and Y. Kingkaew. “Fabrication of PH-Sensing Sodium Alginate Films Containing Clitoria Ternatea Linn. Extract and Drug Release Characteristics”. Progress in Applied Science and Technology, vol. 11, no. 1, Jan. 2021, pp. 38-45, doi:10.14456/past.2021.1.