Ida, Musfiroh, et al. “Alpha-Amylase Inhibitory Activity of Extract Combination of Morinda Citrifolia L. Fruit, Trigonella Foenum-Graecum and Nigella Sativa L. Seeds Using In Vitro and In Vivo Assay: doi.org 10.26538 Tjnpr V4i10.23”. Tropical Journal of Natural Product Research (TJNPR), vol. 4, no. 10, Oct. 2020, pp. 817-23, https://www.tjnpr.org/index.php/home/article/view/1054.