Gunawan, Sri, Maria Theresia Sri Budiastuti, Joko Sutrisno, and Herry Wirianata. “Effects of Organic Materials and Rainfall Intensity on the Productivity of Oil Palm Grown under Sandy Soil Condition”. International Journal on Advanced Science, Engineering and Information Technology 10, no. 1 (February 29, 2020): 356–361. Accessed July 3, 2024. https://ijaseit.insightsociety.org/index.php/ijaseit/article/view/11001.