Dimawarnita, Firda, Khairy Yunda Maharani, Sutanto Sutanto, Yora Faramitha, Donny Nugraha Kalbuadi, and Didiek Hadjar Goenadi. “Extraction and Characterization of Fulvic Acid from Oil Palm Empty Fruit Bunches”. Menara Perkebunan 93, no. 2 (November 7, 2025). Accessed January 10, 2026. https://mp.iribb.org/mpjurnal/article/view/669.