Ahmad Zuhryansyah, Muhammad Nurali, Delyana Rahmawany Pulungan, Antonio Mario Sipayung, and Purjianto. “FACTORS OF PALM OIL HARVESTERS PRODUCTIVITY”. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) 1, no. 9 (August 30, 2022): 559–577. Accessed September 11, 2025. https://ijset.org/index.php/ijset/article/view/388.