Mahardika, R. G., and O. Roanisca. “Microwave-Assisted Extraction of Polyphenol Content from Leaves of Tristaniopsis Merguensis Griff”. ASEAN Journal of Chemical Engineering, Vol. 19, no. 2, Dec. 2019, pp. 110-9, https://journal.ugm.ac.id/v3/AJChE/article/view/9087.