R. Ramadhan, G. Tampubolon, and E. Ermadani, “PENGARUH PEMBERIAN LIMBAH CAIR PABRIK KELAPA SAWIT TERHADAP BEBERAPA SIFAT KIMIA TANAH DAN PERTUMBUHAN BIBIT KELAPA SAWIT PADA PEMBIBITAN UTAMA: The Influence of Liquid Oil Palm Factory Waste on Some Soil Chemical Properties and Growth of Oil Palm Seeds on Main Breeding”, Jurnal Silva Tropika, vol. 5, no. 1, pp. 339-356, Jul. 2021.