Lersprajak, Oraya, Nattawadee Kanpipit, Natsajee Nualkaew, Ploenthip Puthongking, and Suthasinee Thapphasaraphong. “Effects of Dipterocarpus Alatus Leaf and Bark Extracts on UVB-Protection, Collagen Stimulating Activity and Nitric Oxide Inhibition: doi.org 10.26538 Tjnpr V5i9.18”. Tropical Journal of Natural Product Research (TJNPR) 5, no. 9 (September 1, 2021): 1638–1644. Accessed April 7, 2025. https://tjnpr.org/index.php/home/article/view/426.