Rachmawati, Y., D. T. Aprillia, and E. W. Surbakti. “Implementation Of Work Discipline and Work Productivity On Employee Performance at PT Pelabuhan Indonesia (Persero) Regional I Belawan”. Journal Boas : Business, Economics, Accounting And Management, vol. 1, no. 02, July 2023, pp. 88-95, doi:10.54209/boas.v1i02.221.