“ANALISIS KETERAMPILAN DAN KESEHATAN TERHADAP PRODUKTIVITAS TENAGA KERJA PTPN II SEI SEMAYANG”. JOURNAL OF SCIENCE AND SOCIAL RESEARCH 7, no. 4 (November 11, 2024): 1933–1942. Accessed April 14, 2026. https://jurnal.goretanpena.com/index.php/JSSR/article/view/2309.