Sudirman, Acai, Darwin Lie, Sherly Sherly, and Edy Dharma. “The Impact of Work Discipline and Work Ethic on the Teacher Performance of Sultan Agung Pematangsiantar Private Middle School Teachers T.A. 2018 2019”. International Journal of Business Studies 3, no. 3 (January 15, 2020): 125–135. Accessed February 27, 2026. https://ijbs.ipmi.ac.id/index.php/ijbs/article/view/83.