Sarjono, Sarjono, et al. “Analysis of Worker’s Age and Working Time on the Influence of Productivity With Multiple Linear Regression Methods (Case Study of Automotive Spare Parts Manufacturing Company)”. IJIEM - Indonesian Journal of Industrial Engineering and Management, vol. 4, no. 2, June 2023, pp. 157-63, doi:10.22441/ijiem.v4i2.20019.