Hamdani, Zulkarnain Lubis, SitiMardiana, and Syahbuddin Hasibuan. “A Comparative Analysis of Performance and Environmental Variables Between the Use of Organic and Inorganic Fertilizers in Palm Oil”. Elementary Education Online 20, no. 4 (December 19, 2023): 951–964. Accessed June 3, 2024. https://ilkogretim-online.org/index.php/pub/article/view/5291.