Arham, M. A., and S. Junus. “Contributing Factors of Labor Productivity in the Industrial Sector in Indonesia: A Comparative Study Among Regions”. Jurnal Perspektif Pembiayaan Dan Pembangunan Daerah, vol. 8, no. 3, Aug. 2020, pp. 277 -86, doi:10.22437/ppd.v8i3.9626.