Panjaitan, S. R.; Butarbutar, D. F.; Panjaitan, H.; Nainggolan, A. B. D.; Barus, B. S. The Influence of Work Discipline, Work Ethics and Work Environment on Employee Performance at the Regional Company Pasar Horas Jaya, Pematangsiantar City. probis 2022, 13, 109-121.