DAMANIK, Evo M.T; GIRSANG, Tonggo S.; NASUTION, Hidayat; SIMARMATA, Benget; LUMBANTOBING, Lumbantobing. The Effect of Work Discipline on Employee Work Productivity at Perumda Tirtanadi Medan Denai Branch. Innovative: Journal Of Social Science Research, [S. l.], v. 3, n. 6, p. 4043–4056, 2023. Disponível em: http://j-innovative.org/index.php/Innovative/article/view/6641. Acesso em: 5 may. 2026.