Hasibuan, Lisa Pristiwani, Volvo Sihombing, dan Muhammad Halmi Dar. 2021. “IMPLEMENTATION OF EXPERT SYSTEM TO IDENTIFY FORMALIN AND BORAX CONTENT IN FOOD USING THE CERTAINTY FACTOR METHOD”. INFOKUM 9 (2, June), 171-76. https://infor.seaninstitute.org/index.php/infokum/article/view/101.