Ningsih, T., Dimas Akbar Ramadhan Lubis and Saroha Manurung 2019. KAJIAN BIAYA PEMUPUKAN TANAMAN MENGHASILKAN KELAPA SAWIT (Elaeis guineensis Jacq) DI DIVISI F KEBUN SEI KALAM PT. ASAM JAWA . Jurnal Agro Estate. 3, 2 (Dec. 2019), 97–102. DOI:https://doi.org/10.47199/jae.v3i2.68.