Manurung, Hisar Marulitua, and Suprapto Manurung. “Implementation Of Additive Chemistry E-Modules Using the Discovery Learning Model on Student Learning Outcomes on Food Coloring Materials ”. Jurnal Penelitian Pendidikan IPA 9, no. 5 (May 31, 2023): 2472–2477. Accessed November 22, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/3386.