Sagutray Simangunsong, R. “Analysis of Factors Affecting Work Productivity of Tea Pickers at the Tea and Quinine Research Center, Simalungun Regency”. Journal of Accounting Research, Utility Finance and Digital Assets, vol. 1, no. 1, Aug. 2022, pp. 37-42, doi:10.54443/jaruda.v1i1.5.