Hard, E. ., U. N. Harahap, and D. W. . Utama. “Optimizing Work Productivity at PT SEN Through Analysis of Employee Needs Using the Quality Function Deployment Method”. IRA Jurnal Teknik Mesin Dan Aplikasinya (IRAJTMA), vol. 2, no. 3, Dec. 2023, pp. 36-43, doi:10.56862/irajtma.v2i3.77.