D. R. Pulungan, F. Roosmawati, A. Widjajanto, M. R. A. Hasibuan, A. M. Sipayung, and M. A. rasyid, “IDENTIFICATION OF FACTORS INFLUENCING EMPLOYEE WORK PRODUCTIVITY IN OIL PALM PLANTATIONS”, Injects, vol. 6, no. 1, pp. 139–147, May 2025.