PURBA, S. B. (2019) “The Effect of Work Conflict on Teacher Performance in Sinar Harapan Education Foundation. Beringin Deli Serdang Regency”, Journal of Management Science (JMAS), 2(2, April), pp. 26–30. Available at: https://exsys.iocspublisher.org/index.php/JMAS/article/view/26 (Accessed: 2May2026).