Melshandi, H. D. S., J. K. R. R. Samarasekera, S. M. Handunnetti, O. V. D. S. J. Weerasena, R. Maharjan, and M. I. Choudhary. “Investigation of β-Lactamase Enzyme Inhibitory, Anti-Bacterial and Anti-Fungal Bio-Activities of Dillenia Retusa Thumb: An Endemic Medicinal Plant to Sri Lanka”. South Asian Research Journal of Natural Products, Vol. 3, no. 4, Oct. 2020, pp. 1-12,