I. Husori, D. et al. 2021. Antisecretory Effect of the Combination of Pegagan (Centella Asiatica) and Sambiloto (Andrographis paniculata) Leaves Ethanol Extracts on Pyloric Ligation-Induced Gastric Ulcer in Rats: doi.org/10.26538/tjnpr/v5i10.8. Tropical Journal of Natural Product Research (TJNPR). 5, 10 (Oct. 2021), 1743–1746.