Y. A. Harahap, K. . Hasibuan, W. S. . Dalimunthe, and A. . Hasibuan, “Utilization of Empty Oil Palm Bunch as an Alternative of Organic Fertilizer at PTPN III Labuhanbatu Selatan”, FJST, vol. 2, no. 7, pp. 1667–1676, Jul. 2023.