Arif , Muhammad, et al. “Faktor Faktor Produktivitas Kerja Karyawan Panen Kelapa Sawit Di PTPN 4 Kebun Adolina”. Jurnal Research Ilmu Pertanian, vol. 5, no. 2, July 2025, pp. 118-24, https://doi.org/10.31933/29wpbh87.