Ajayi, Olukayode S., et al. “Alpha Amylase Inhibition and Antioxidant Activities of Bicyclic Diterpenoid Lactones from Andrographis Paniculata: doi.org 10.26538 Tjnpr V5i6.22”. Tropical Journal of Natural Product Research (TJNPR), vol. 5, no. 6, June 2021, pp. 1110-7, https://tjnpr.org/index.php/home/article/view/634.