Aung, Hnin M., et al. “Effects of Thanaka (Hesperethusa Crenulata) Stem Bark Extract on Collagen Activation and Anti-Melanogenesis for Cosmetic Applications: Http: www.doi.org 10.26538 Tjnpr V8i1.21”. Tropical Journal of Natural Product Research (TJNPR), vol. 8, no. 1, Feb. 2024, pp. 5852-60, https://tjnpr.org/index.php/home/article/view/3396.