PURBA, Sopianna Br. 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):26-30. https://exsys.iocspublisher.org/index.php/JMAS/article/view/26.