Alfatwa, D. A., Roosmawati, F., Ningsih, T., & Widjajanto, A. (2026). Analisis Harga Pokok Produksi Kelapa Sawit di Afdeling I Kebun Bangun PT Perkebunan Nusantara IV Regional I. Ranah Research : Journal of Multidisciplinary Research and Development, 8(4), 2629-2634. https://doi.org/10.38035/rrj.v8i4.2200