Simanjuntak, Ernawati, Prasetyo Prasetyo, and Hartal Hartal. “The Effect of Local Organic Fertilizer from Rubber Processing Waste on the Yield of Rubber Plants”. Akta Agrosia 21, no. 1 (July 31, 2018): 25–28. Accessed May 7, 2024. https://ejournal.unib.ac.id/Agrosia/article/view/4579.