Sihombing, I. R. T. “The The Effect of Work Discipline and Teamwork on Employee Productivity at Pt Pelabuhan Indonesia Regional 1 (Persero)”. Journal Business and Management, vol. 2, no. 2, Oct. 2024, pp. 272-88, https://ejournal.uhn.ac.id/index.php/business_management/article/view/2442.