PURBA, S. B. “The Effect of Work Conflict on Teacher Performance in Sinar Harapan Education Foundation. Beringin Deli Serdang Regency”. Journal of Management Science (JMAS), vol. 2, no. 2, April, Apr. 2019, pp. 26-30, https://exsys.iocspublisher.org/index.php/JMAS/article/view/26.