Jaidee, R. ., S. . Kongpetch, A. Prawan, L. . Senggunprai, U. . Kukongviriyapan, and V. . Kukongviriyapan. “Quercetin Enhances Phenformin in Inhibition of Cholangiocarcinoma Cell Growth”. Srinagarind Medical Journal, vol. 35, no. 3, May 2020, pp. 249-54, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/243311.