Gurning, Kasta. “Determination Antioxidant Activities Methanol Extracts of Bangun-Bangun (Coleus Amboinicus L.) Leaves With DPPH Method”. Jurnal Pendidikan Kimia 12, no. 2 (August 3, 2020): 62–69. Accessed May 21, 2025. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/19397.