Nasution, I., E. Yanti, and M. Insan. “Analysis Of Non-Physical Work Environment, Work Ethics, Work Discipline On Employee Work Productivity Asn At Lldikti Region 1 North Sumatra”. Jurnal Fokus Manajemen, Vol. 5, no. 3, July 2025, pp. 371-80, doi:10.37676/jfm.v5i3.8949.