Panjaitan, Dedy Hermanto. “The Effect of Leadership Style and Work Motivation on Employee Performance at PT. Alpha Ems (Enterprise Management Solution) Medan Branch”. Journal of Management Science (JMAS) 4, no. 1 (January 31, 2021): 6–12. Accessed May 1, 2026. https://www.exsys.iocspublisher.org/index.php/JMAS/article/view/102.