Harahap, Lokot Muda. “Employee Performance Model: Implementation of Work Environment Work Discipline and Competence”. International Journal of Economic, Technology and Social Sciences (Injects) 2, no. 2 (October 19, 2021): 431–444. Accessed August 23, 2025. https://jurnal.ceredindonesia.or.id/index.php/injects/article/view/507.